Development of a nuclear bomb. A nuclear bomb is a weapon whose possession is already a deterrent. Video about the Russian Tsar Bomba

The question of the creators of the first Soviet nuclear bomb is quite controversial and requires a more detailed study, but who really father of the Soviet atomic bomb, there are several entrenched opinions. Most physicists and historians believe that the main contribution to the creation of Soviet nuclear weapons was made by Igor Vasilyevich Kurchatov. However, some express the opinion that without Yuli Borisovich Khariton, the founder of Arzamas-16 and the creator of the industrial basis for obtaining enriched fissile isotopes, the first test of this type of weapon in the Soviet Union would have dragged on for several more years.

Let us consider the historical sequence of research and development work on the creation of a practical sample of an atomic bomb, leaving aside the theoretical studies of fissile materials and the conditions for the occurrence of a chain reaction, without which nuclear explosion impossible.

For the first time, a series of applications for obtaining copyright certificates for the invention (patents) of the atomic bomb was filed in 1940 by employees of the Kharkov Institute of Physics and Technology F. Lange, V. Spinel and V. Maslov. The authors considered issues and proposed solutions for the enrichment of uranium and its use as an explosive. The proposed bomb had a classic detonation scheme (gun type), which was subsequently used, with some modifications, to initiate a nuclear explosion in American uranium-based nuclear bombs.

Great Patriotic War slowed down theoretical and experimental research in the field of nuclear physics, and the largest centers (Kharkov Institute of Physics and Technology and the Radium Institute - Leningrad) ceased their activities and were partially evacuated.

Beginning in September 1941, the intelligence agencies of the NKVD and the Main Intelligence Directorate of the Red Army began to receive an increasing amount of information about the special interest shown in the military circles of Great Britain in the development of explosives based on fissile isotopes. In May 1942, the Main Intelligence Directorate, summarizing the materials received, reported to the State Defense Committee (GKO) on the military purpose of ongoing nuclear research.

Around the same time, Lieutenant Technician Georgy Nikolayevich Flerov, who in 1940 was one of the discoverers of spontaneous fission of uranium nuclei, wrote a letter personally to I.V. Stalin. In his message, the future academician, one of the creators of Soviet nuclear weapons, draws attention to the fact that publications on works related to fission have disappeared from the scientific press of Germany, Great Britain and the United States. atomic nucleus. According to the scientist, this may indicate the reorientation of "pure" science in the practical military field.

In October-November 1942, the foreign intelligence service of the NKVD reported to L.P. Beria, all available information about work in the field of nuclear research, obtained by illegal intelligence officers in England and the USA, on the basis of which the People's Commissar writes a memorandum to the head of state.

At the end of September 1942, I.V. Stalin signs the decree State Committee defense on the resumption and intensification of "works on uranium", and in February 1943, after studying the materials submitted by L.P. Beria, a decision is made to transfer all research on the creation of nuclear weapons (atomic bombs) into a "practical channel". General management and coordination of all types of work were entrusted to the Deputy Chairman of the GKO V.M. Molotov, the scientific management of the project was entrusted to I.V. Kurchatov. The management of work on the search for deposits and the extraction of uranium ore was entrusted to A.P. Zavenyagin, M.G. was responsible for the creation of enterprises for the enrichment of uranium and the production of heavy water. Pervukhin, and the People's Commissar of Nonferrous Metallurgy P.F. Lomako "trusted" by 1944 to accumulate 0.5 tons of metallic (enriched to the required standards) uranium.

At this, the first stage (the deadlines for which were disrupted), providing for the creation of an atomic bomb in the USSR, was completed.

After the United States dropped atomic bombs on Japanese cities, the leadership of the USSR saw firsthand the backlog of scientific research and practical work to create nuclear weapons from their competitors. To intensify and create an atomic bomb as soon as possible, on August 20, 1945, a special decree of the GKO was issued on the creation of Special Committee No. 1, whose functions included organizing and coordinating all types of work to create a nuclear bomb. L.P. is appointed the head of this emergency body with unlimited powers. Beria, the scientific leadership is entrusted to I.V. Kurchatov. The direct management of all research, design and production enterprises was to be carried out by the People's Commissar for Armaments B.L. Vannikov.

Due to the fact that scientific, theoretical and experimental studies were completed, intelligence data on the organization of industrial production of uranium and plutonium were obtained, the scouts obtained schemes for American atomic bombs, the greatest difficulty was the transfer of all types of work to an industrial basis. To create enterprises for the production of plutonium, the city of Chelyabinsk - 40 was built from scratch (scientific supervisor I.V. Kurchatov). In the village of Sarov (future Arzamas - 16), an assembly and production plant was built in industrial scale the atomic bombs themselves (supervisor - chief designer Yu.B. Khariton).

Thanks to the optimization of all types of work and strict control over them by L.P. Beria, who, however, did not prevent creative development ideas incorporated into the projects, in July 1946, technical specifications for the creation of the first two Soviet atomic bombs were developed:

• "RDS - 1" - a bomb with a plutonium charge, the explosion of which was carried out according to the implosive type;
• "RDS - 2" - a bomb with a cannon detonation of a uranium charge.

I.V. Kurchatov.

Paternity rights

Tests of the first atomic bomb created in the USSR "RDS - 1" (the abbreviation in different sources stands for - "jet engine C" or "Russia makes itself") took place in the last days of August 1949 in Semipalatinsk under the direct supervision of Yu.B. Khariton. The power of the nuclear charge was 22 kilotons. However, from the point of view of modern copyright law, it is impossible to attribute paternity to this product to any of the Russian (Soviet) citizens. Earlier, when developing the first practical model suitable for military use, the Government of the USSR and the leadership of Special Project No. 1 decided to copy as much as possible the domestic implosion bomb with a plutonium charge from the American Fat Man prototype dropped on the Japanese city of Nagasaki. Thus, the “fatherhood” of the first nuclear bomb of the USSR rather belongs to General Leslie Groves, the military leader of the Manhattan project, and Robert Oppenheimer, known throughout the world as the “father of the atomic bomb” and who provided scientific leadership on the project. "Manhattan". The main difference between the Soviet model and the American one is the use of domestic electronics in the detonation system and a change in the aerodynamic shape of the bomb body.

The first "purely" Soviet atomic bomb can be considered the product "RDS - 2". Despite the fact that it was originally planned to copy the American uranium prototype "Kid", the Soviet uranium atomic bomb "RDS - 2" was created in an implosive version, which had no analogues at that time. L.P. participated in its creation. Beria - general project management, I.V. Kurchatov is the scientific supervisor of all types of work and Yu.B. Khariton is the scientific adviser and chief designer responsible for the manufacture of a practical sample of the bomb and its testing.

Speaking about who is the father of the first Soviet atomic bomb, one should not lose sight of the fact that both RDS - 1 and RDS - 2 were blown up at the test site. The first atomic bomb dropped from the Tu - 4 bomber was the RDS - 3 product. Its design repeated the RDS-2 implosion bomb, but had a combined uranium-plutonium charge, thanks to which it was possible to increase its power, with the same dimensions, up to 40 kilotons. Therefore, in many publications, Academician Igor Kurchatov is considered the “scientific” father of the first atomic bomb actually dropped from an aircraft, since his colleague in the scientific workshop, Yuli Khariton, was categorically against making any changes. The fact that in the entire history of the USSR L.P. Beria and I.V. Kurchatov were the only ones who in 1949 were awarded the title of Honorary Citizen of the USSR - "... for the implementation of the Soviet atomic project, the creation of an atomic bomb."

The investigation took place in April-May 1954 in Washington and was called, in the American manner, "hearings."
Physicists participated in the hearings (with a capital P!), but for the scientific world of America the conflict was unprecedented: not a dispute about priority, not an undercover struggle of scientific schools, and not even the traditional confrontation between a forward-looking genius and a crowd of mediocre envious people. In the proceedings, the keyword "loyalty" sounded imperiously. The accusation of "disloyalty", which acquired a negative, formidable meaning, entailed punishment: deprivation of access to works of the highest secrecy. The action took place in the Commission on atomic energy(KAE). Main characters:

Robert Oppenheimer, New York native, US pioneer of quantum physics, scientific director of the Manhattan Project, "father of the atomic bomb", successful scientific manager and refined intellectual, after 1945 national hero America...

During World War II, the brilliant physicist Ajulius Robert Oppenheimer led the development of American nuclear scientists to create the first atomic bomb in human history. The scientist led a secluded and secluded life, and this gave rise to suspicions of treason.

Atomic weapons are the result of all previous developments in science and technology. Discoveries that are directly related to its occurrence were made at the end of the 19th century. A huge role in revealing the secrets of the atom was played by the studies of A. Becquerel, Pierre Curie and Marie Sklodowska-Curie, E. Rutherford and others.

At the beginning of 1939 French physicist Joliot-Curie concluded that a chain reaction was possible, which would lead to an explosion of monstrous destructive power and that uranium could become an energy source, like an ordinary explosive. This conclusion was the impetus for the development of nuclear weapons.

From 1939 to 1945, more than two billion dollars were spent on the Manhattan Project. A huge uranium refinery was built at Oak Ridge, Tennessee. H.C. Urey and Ernest O. Lawrence (inventor of the cyclotron) proposed a purification method based on the principle of gaseous diffusion followed by magnetic separation of two isotopes. A gas centrifuge separated the light Uranium-235 from the heavier Uranium-238.

On the territory of the United States, in Los Alamos, in the desert expanses of the state of New Mexico, in 1942, an American nuclear center. Many scientists worked on the project, but the main one was Robert Oppenheimer. Under his leadership, the best minds of that time were gathered not only in the United States and England, but almost all Western Europe. A huge team worked on the creation of nuclear weapons, including 12 laureates Nobel Prize. Work in Los Alamos, where the laboratory was located, did not stop for a minute. In Europe, meanwhile, the Second World War, and Germany carried out mass bombing of the cities of England, which endangered the English atomic project “Tub Alloys”, and England voluntarily transferred its developments and leading scientists of the project to the USA, which allowed the USA to take a leading position in the development of nuclear physics (the creation of nuclear weapons).

Writing about this controversial man is not an easy task, but an interesting one, and the 20th century was marked by a number of books about him. However, the rich life of the scientist continues to attract biographers.

Oppenheimer was born in New York in 1903 to wealthy and educated Jewish parents. Oppenheimer was brought up in love for painting, music, in an atmosphere of intellectual curiosity. In 1922, he entered Harvard University and in just three years received an honors degree, his main subject was chemistry. In the next few years, the precocious young man traveled to several countries in Europe, where he worked with physicists who dealt with the problems of investigating atomic phenomena in the light of new theories. Just a year after graduating from university, Oppenheimer published a scientific paper that showed how deeply he understood new methods. Soon he, together with the famous Max Born, developed the most important part of quantum theory, known as the Born-Oppenheimer method. In 1927, his outstanding doctoral dissertation brought him worldwide fame.

In 1928 he worked at the Zurich and Leiden universities. In the same year he returned to the USA. From 1929 to 1947 Oppenheimer taught at University of California and California Institute of Technology. From 1939 to 1945 he actively participated in the work on the creation of an atomic bomb as part of the Manhattan Project; heading the specially created Los Alamos laboratory.

In 1939, the United States learned that in preparation for global war Nazi Germany discovered the fission of the atomic nucleus. Oppenheimer and other scientists immediately guessed that the German physicists would try to create a controlled chain reaction that could be the key to creating a weapon far more destructive than any that existed at that time. Enlisting the support of the great scientific genius, Albert Einstein, concerned scientists warned President Franklin D. Roosevelt of the danger in a famous letter. In authorizing funding for projects aimed at creating untested weapons, the president acted in strict secrecy. Ironically, many leading scientists worked with American scientists in laboratories scattered throughout the country. scientists of the world forced to flee their homeland. One part of the university groups explored the possibility of creating a nuclear reactor, others took up the solution of the problem of separating the uranium isotopes necessary for the release of energy in a chain reaction. Oppenheimer, who had previously been occupied with theoretical problems, was offered to organize a wide front of work only at the beginning of 1942.

Three days after the "Kid" was blown up in Hiroshima, an exact copy of the first "Fat Man" was dropped on the city of Nagasaki. On August 15, Japan, whose resolve had finally been broken by this new weapon, signed an unconditional surrender. However, the voices of skeptics were already being heard, and Oppenheimer himself predicted two months after Hiroshima that "mankind will curse the names of Los Alamos and Hiroshima."

The whole world was shocked by the explosions in Hiroshima and Nagasaki. Tellingly, Oppenheimer managed to combine the excitement of testing a bomb on civilians and the joy that the weapon had finally been tested.

Nevertheless, the following year he accepted an appointment as chairman of the scientific council of the Atomic Energy Commission (AEC), thus becoming the most influential adviser to the government and the military on nuclear issues. While the West and the Stalin-led Soviet Union were seriously preparing for cold war, each side focused on the arms race. Although many of the scientists who were part of the Manhattan Project did not support the idea of ​​\u200b\u200bcreating a new weapon, former employees Oppenheimer Edward Teller and Ernest Lawrence believed that National security USA needs to be developed as soon as possible hydrogen bomb. Oppenheimer was horrified. From his point of view, the two nuclear powers were already opposed to each other, like "two scorpions in a jar, each able to kill the other, but only at the risk of his own life." With the spread of new weapons in wars, there would no longer be winners and losers - only victims. And the "father of the atomic bomb" made a public statement that he was against the development of the hydrogen bomb. Always feeling out of place under Oppenheimer and clearly envious of his achievements, Teller began to make efforts to lead new project, implying that Oppenheimer should no longer be involved in the work. He told FBI investigators that his rival was keeping scientists from working on the hydrogen bomb with his authority, and revealed the secret that Oppenheimer suffered bouts of severe depression in his youth. When President Truman agreed in 1950 to finance the development of the hydrogen bomb, Teller could celebrate victory.

In 1954, Oppenheimer's enemies launched a campaign to remove him from power, which they succeeded after a month-long search for "black spots" in his personal biography. As a result, a show case was organized in which Oppenheimer was opposed by many influential political and scientific figures. As Albert Einstein later put it: "Oppenheimer's problem was that he loved a woman who didn't love him: the US government."

By allowing Oppenheimer's talent to flourish, America doomed him to death.

Oppenheimer owns a number of popular books, including Science and the Common Understanding (Science and the Common Understanding, 1954), The Open Mind (The Open Mind, 1955), Some Reflections on Science and Culture (Some Reflections on Science and Culture, 1960) . Oppenheimer died in Princeton on February 18, 1967.

IN Soviet times it was claimed that the USSR solved its atomic problem completely independently, and Kurchatov was considered the "father" of the domestic atomic bomb. Although there were rumors about some secrets stolen from the Americans. And only in the 90s, 50 years later, one of the main actors of that time, Yuli Khariton, spoke about the significant role of intelligence in accelerating the laggard Soviet project. And American scientific and technical results were obtained by Klaus Fuchs, who arrived in the English group.

Information from abroad helped the country's leadership to make a difficult decision - to start work on nuclear weapons during the most difficult war. Exploration allowed our physicists to save time, helped to avoid a "misfire" at the first atomic test which was of great political importance.

In 1939, a chain reaction of fission of uranium-235 nuclei was discovered, accompanied by the release of colossal energy. Shortly thereafter from the pages scientific journals articles on nuclear physics began to disappear. This could indicate a real prospect of creating an atomic explosive and weapons based on it.

After the discovery by Soviet physicists of spontaneous fission of uranium-235 nuclei and the determination of the critical mass, a corresponding directive was sent to the residency at the initiative of the head of the scientific and technological revolution L. Kvasnikov.

In the FSB of Russia (the former KGB of the USSR), under the heading "keep forever" lie 17 volumes of archival file N 13676, which documented who and how attracted US citizens to work on Soviet intelligence. Only a few of the top leadership of the KGB of the USSR had access to the materials of this case, the classification of which was removed only recently. Soviet intelligence received the first information about the work on the creation of the American atomic bomb in the fall of 1941. And already in March 1942, extensive information about the ongoing research in the United States and England fell on the table of I.V. Stalin. According to Yu. B. Khariton, in that dramatic period it was more reliable to use the bomb scheme already tested by the Americans for our first explosion. “Taking into account the interests of the state, any other decision was then unacceptable. The merit of Fuchs and our other assistants abroad is undoubted. However, we implemented the American scheme in the first test not so much from technical as from political considerations.

A test site was built near the city of Semipalatinsk. Exactly at 7:00 am on August 29, 1949, the first Soviet nuclear device under the code name "RDS-1".

The Troyan plan, according to which atomic bombs were to be dropped on 70 cities of the USSR, was thwarted due to the threat of a retaliatory strike. The event that took place at the Semipalatinsk test site informed the world about the creation of nuclear weapons in the USSR.

7 countries with nuclear weapons form a nuclear club. Each of these states spent millions to create their own atomic bomb. Development has been going on for years. But without the gifted physicists who were assigned to conduct research in this area, nothing would have happened. About these people in today's Diletant selection. media.

Robert Oppenheimer

The parents of the man under whose leadership the world's first atomic bomb was created had nothing to do with science. Oppenheimer's father was a textile trader, and his mother was an artist. Robert graduated early from Harvard, took a course in thermodynamics and became interested in experimental physics.


After several years of work in Europe, Oppenheimer moved to California, where he lectured for two decades. When the Germans discovered the fission of uranium in the late 1930s, the scientist thought about the problem of nuclear weapons. Since 1939, he was actively involved in the creation of the atomic bomb as part of the Manhattan Project and directed the laboratory at Los Alamos.

In the same place, on July 16, 1945, Oppenheimer's "brainchild" was first tested. "I have become death, the destroyer of worlds," said the physicist after the test.

A few months later, atomic bombs were dropped on the Japanese cities of Hiroshima and Nagasaki. Oppenheimer has since insisted on the use of atomic energy exclusively for peaceful purposes. Having become a defendant in a criminal case because of his unreliability, the scientist was removed from secret developments. He died in 1967 from cancer of the larynx.

Igor Kurchatov

The USSR acquired its own atomic bomb four years later than the Americans. It was not without the help of scouts, but the merits of the scientists working in Moscow should not be underestimated. Atomic research was led by Igor Kurchatov. His childhood and youth were spent in the Crimea, where he first trained as a locksmith. Then he graduated from the Faculty of Physics and Mathematics of the Tauride University, continued to study in Petrograd. There he entered the laboratory of the famous Abram Ioffe.

Kurchatov took charge of the Soviet nuclear project when he was only 40 years old. Years of painstaking work involving leading experts have brought long-awaited results. The first nuclear weapon in our country called RDS-1 was tested at the test site in Semipalatinsk on August 29, 1949.

The experience accumulated by Kurchatov and his team allowed the Soviet Union to subsequently launch the world's first industrial nuclear power plant, as well as a nuclear reactor for a submarine and an icebreaker, which no one has been able to do before.

Andrey Sakharov

The hydrogen bomb appeared first in the United States. But the American sample was the size of a three-story house and weighed more than 50 tons. Meanwhile, the RDS-6s product, created by Andrei Sakharov, weighed only 7 tons and could fit on a bomber.

During the war, Sakharov, while in evacuation, graduated with honors from Moscow State University. He worked as an engineer-inventor at a military plant, then entered the FIAN graduate school. Under the leadership of Igor Tamm, he worked in a research group for the development of thermonuclear weapons. Sakharov came up with the basic principle of the Soviet hydrogen bomb - puff.

Tests of the first Soviet hydrogen bomb took place in 1953

The first Soviet hydrogen bomb was tested near Semipalatinsk in 1953. To assess the destructive capabilities, a city was built on the site from industrial and administrative buildings.

Since the late 1950s, Sakharov devoted much time to human rights activities. He condemned the arms race, criticized the communist government, spoke out for the abolition of the death penalty and against the forced psychiatric treatment of dissidents. He opposed the entry of Soviet troops into Afghanistan. Andrei Sakharov was awarded the Nobel Peace Prize, and in 1980 he was exiled to Gorky for his beliefs, where he repeatedly went on hunger strikes and from where he was able to return to Moscow only in 1986.

Bertrand Goldschmidt

The ideologist of the French nuclear program was Charles de Gaulle, and the creator of the first bomb was Bertrand Goldschmidt. Before the start of the war, the future specialist studied chemistry and physics, joined Marie Curie. The German occupation and the attitude of the Vichy government towards the Jews forced Goldschmidt to stop his studies and emigrate to the United States, where he collaborated first with American and then with Canadian colleagues.


In 1945, Goldschmidt became one of the founders of the French Atomic Energy Commission. The first test of the bomb created under his leadership took place only 15 years later - in the south-west of Algeria.

Qian Sanqiang

China joined the club nuclear powers only in October 1964. Then the Chinese tested their own atomic bomb with a capacity of more than 20 kilotons. Mao Zedong decided to develop this industry after his first trip to the Soviet Union. In 1949, Stalin showed the possibilities of nuclear weapons to the great helmsman.

Qian Sanqiang was in charge of the Chinese nuclear project. A graduate of the Physics Department of Tsinghua University, he went to study in France at public expense. He worked at the Radium Institute of the University of Paris. Qian talked a lot with foreign scientists and carried out quite serious research, but he missed his homeland and returned to China, taking several grams of radium as a gift from Irene Curie.

In the 30s of the last century, many physicists worked on the creation of an atomic bomb. It is officially believed that the United States was the first to create, test and use the atomic bomb. However, I recently read books by Hans-Ulrich von Krantz, a researcher of the secrets of the Third Reich, where he claims that the Nazis invented the bomb, and the world's first atomic bomb was tested by them in March 1944 in Belarus. The Americans seized all the documents about the atomic bomb, scientists and the samples themselves (there were, allegedly, 13). So the Americans had 3 samples available, and the Germans transported 10 to a secret base in Antarctica. Kranz confirms his conclusions by the fact that after Hiroshima and Nagasaki in the USA there was no news of bomb tests of more than 1.5, and after that the tests were unsuccessful. This, in his opinion, would not be possible if the bombs were created by the United States itself.

We are unlikely to know the truth.

In 1940, Enrico Fermi finished working on a theory called Nuclear Chain Reaction. After that, the Americans created their first nuclear reactor. In 1945, the Americans created three atomic bombs. The first was blown up in their state of New Mexico, and the next two were dropped on Japan.

It is hardly possible to specifically name any person that he is the creator of atomic (nuclear) weapons. Without the discoveries of the predecessors, there would be no final result. But, many call it Otto Hahn, a German-born nuclear chemist, the father of the atomic bomb. Apparently, it was his discoveries in the field of nuclear fission, together with Fritz Strassmann, that can be considered fundamental in the creation of nuclear weapons.

father Soviet weapons mass destruction it is customary to consider Igor Kurchatov and Soviet intelligence and personally Klaus Fuchs. However, do not forget about the discoveries of our scientists in the late 30s. Work on the fission of uranium was carried out by A. K. Peterzhak and G. N. Flerov.

The atomic bomb is a product that was not invented immediately. In order to come to a result, it took decades of various studies. Before copies were invented for the first time in 1945, many experiments and discoveries were made. All scientists who are related to these works can be counted among the creators of the atomic bomb. Besom speaks directly about the team of inventors of the bomb itself, then there was a whole team, it is better to read about this on Wikipedia.

A large number of scientists and engineers from various industries took part in the creation of the atomic bomb. To name just one would be unfair. The material from Wikipedia does not mention the French physicist Henri Becquerel, Russian scientists Pierre Curie and his wife Maria Sklodowska-Curie, who discovered the radioactivity of uranium, the German theoretical physicist Albert Einstein.

Quite an interesting question.

After reading the information on the Internet, I concluded that the USSR and the USA began to work on the creation of these bombs at the same time.

More details, I think, you will read in the article. Everything is written there in great detail.

Many discoveries have their own parents, but inventions are often the collective result of a common cause, when everyone contributed. In addition, many inventions are, as it were, a product of their era, so work on them is carried out simultaneously in different laboratories. so with the atomic bomb, there is no single parent.

Quite a difficult task, it is difficult to say who exactly invented the atomic bomb, because many scientists were involved in its appearance, who consistently worked on the study of radioactivity, uranium enrichment, the chain reaction of fission of heavy nuclei, etc. Here are the main points of its creation:

By 1945, American scientists had invented two atomic bombs. Baby weighed 2722 kg and was equipped with enriched Uranium-235 and fat man with a charge of Plutonium-239 with a power of more than 20 kt had a mass of 3175 kg.

On given time completely different in size and shape

Work on nuclear projects in the US and the USSR began simultaneously. In July 1945, an American atomic bomb (Robert Oppenheimer, head of the laboratory) was detonated at the test site, and then bombs were also dropped on the notorious Nagasaki and Hiroshima, respectively, in August. The first test of a Soviet bomb took place in 1949 (project manager Igor Kurchatov), ​​but as they say, its creation was made possible thanks to excellent intelligence.

There is also information that, in general, the Germans were the creators of the atomic bomb .. For example, you can read about this here ..

There is simply no unambiguous answer to this question - many of the most talented physicists and chemists, whose names are listed in this article, worked on the creation of a deadly weapon capable of destroying the planet - as you can see, the inventor was far from alone.

The world of the atom is so fantastic that its understanding requires a radical break in the usual concepts of space and time. Atoms are so small that if a drop of water could be enlarged to the size of the Earth, each atom in that drop would be smaller than an orange. In fact, one drop of water is made up of 6000 billion billion (6000000000000000000000) hydrogen and oxygen atoms. And yet, despite its microscopic size, the atom has a structure to some extent similar to the structure of our solar system. In its incomprehensibly small center, the radius of which is less than one trillionth of a centimeter, is a relatively huge "sun" - the nucleus of an atom.

Around this atomic "sun" tiny "planets" - electrons - revolve. The nucleus consists of two main building blocks of the Universe - protons and neutrons (they have a unifying name - nucleons). An electron and a proton are charged particles, and the amount of charge in each of them is exactly the same, but the charges differ in sign: the proton is always positively charged, and the electron is always negative. The neutron does not carry an electric charge and therefore has a very high permeability.

In the atomic measurement scale, the mass of the proton and neutron is taken as unity. The atomic weight of any chemical element therefore depends on the number of protons and neutrons contained in its nucleus. For example, a hydrogen atom, whose nucleus consists of only one proton, has an atomic mass of 1. A helium atom, with a nucleus of two protons and two neutrons, has an atomic mass of 4.

The nuclei of atoms of the same element always contain the same number of protons, but the number of neutrons may be different. Atoms that have nuclei with the same number of protons, but differ in the number of neutrons and related to varieties of the same element, are called isotopes. To distinguish them from each other, a number is assigned to the symbol of the element, equal to the sum of all particles in the nucleus of a given isotope.

The question may arise: why does the nucleus of an atom not fall apart? After all, the protons included in it are electrically charged particles with the same charge, which must repel each other with great force. This is explained by the fact that inside the nucleus there are also so-called intranuclear forces that attract the particles of the nucleus to each other. These forces compensate for the repulsive forces of protons and do not allow the nucleus to fly apart spontaneously.

The intranuclear forces are very strong, but they act only at very close range. Therefore, nuclei of heavy elements, consisting of hundreds of nucleons, turn out to be unstable. The particles of the nucleus are in constant motion here (within the volume of the nucleus), and if you add some additional amount of energy to them, they can overcome internal forces - the nucleus will be divided into parts. The amount of this excess energy is called the excitation energy. Among the isotopes of heavy elements, there are those that seem to be on the very verge of self-decay. Only a small "push" is enough, for example, a simple hit in the nucleus of a neutron (and it does not even have to be accelerated to a high speed) for the nuclear fission reaction to start. Some of these "fissile" isotopes were later made artificially. In nature, there is only one such isotope - it is uranium-235.

Uranium was discovered in 1783 by Klaproth, who isolated it from uranium pitch and named it after recently open planet Uranus. As it turned out later, it was, in fact, not uranium itself, but its oxide. Pure uranium, a silvery-white metal, was obtained
only in 1842 Peligot. The new element did not have any remarkable properties and did not attract attention until 1896, when Becquerel discovered the phenomenon of radioactivity of uranium salts. After that, uranium became the object of scientific research and experiments, but still had no practical application.

When, in the first third of the 20th century, the structure of the atomic nucleus more or less became clear to physicists, they first of all tried to fulfill the old dream of alchemists - they tried to turn one chemical element in another. In 1934, the French researchers, the spouses Frederic and Irene Joliot-Curie, reported to the French Academy of Sciences about the following experiment: when aluminum plates were bombarded with alpha particles (nuclei of the helium atom), aluminum atoms turned into phosphorus atoms, but not ordinary, but radioactive, which, in turn, passed into a stable isotope of silicon. Thus, an aluminum atom, having added one proton and two neutrons, turned into a heavier silicon atom.

This experience led to the idea that if the nuclei of the heaviest of the elements existing in nature - uranium, are "shelled" with neutrons, then an element can be obtained that does not exist in natural conditions. In 1938, the German chemists Otto Hahn and Fritz Strassmann repeated in in general terms the experience of the Joliot-Curie spouses, taking uranium instead of aluminum. The results of the experiment were not at all what they expected - instead of a new superheavy element with a mass number greater than that of uranium, Hahn and Strassmann received light elements from the middle part periodic system: barium, krypton, bromine and some others. The experimenters themselves could not explain the observed phenomenon. It was not until the following year that the physicist Lise Meitner, to whom Hahn reported her difficulties, found the correct explanation for the observed phenomenon, suggesting that when uranium was bombarded with neutrons, its nucleus split (fissioned). In this case, nuclei of lighter elements should have been formed (this is where barium, krypton and other substances were taken from), as well as 2-3 free neutrons should have been released. Further research allowed to clarify in detail the picture of what is happening.

Natural uranium consists of a mixture of three isotopes with masses of 238, 234 and 235. The main amount of uranium falls on the 238 isotope, the nucleus of which includes 92 protons and 146 neutrons. Uranium-235 is only 1/140 of natural uranium (0.7% (it has 92 protons and 143 neutrons in its nucleus), and uranium-234 (92 protons, 142 neutrons) is only 1/17500 of total mass uranium (0.006%. The least stable of these isotopes is uranium-235.

From time to time, the nuclei of its atoms spontaneously divide into parts, as a result of which lighter elements of the periodic system are formed. The process is accompanied by the release of two or three free neutrons, which rush at a tremendous speed - about 10 thousand km / s (they are called fast neutrons). These neutrons can hit other uranium nuclei, causing nuclear reactions. Each isotope behaves differently in this case. Uranium-238 nuclei in most cases simply capture these neutrons without any further transformations. But in about one case out of five, when a fast neutron collides with the nucleus of the 238 isotope, a curious nuclear reaction occurs: one of the uranium-238 neutrons emits an electron, turning into a proton, that is, the uranium isotope turns into more
the heavy element is neptunium-239 (93 protons + 146 neutrons). But neptunium is unstable - after a few minutes one of its neutrons emits an electron, turning into a proton, after which the neptunium isotope turns into the next element of the periodic system - plutonium-239 (94 protons + 145 neutrons). If a neutron enters the nucleus of unstable uranium-235, then fission immediately occurs - the atoms decay with the emission of two or three neutrons. It is clear that in natural uranium, most of whose atoms belong to the 238 isotope, this reaction has no visible consequences - all free neutrons will eventually be absorbed by this isotope.

But what if we imagine a fairly massive piece of uranium, consisting entirely of the 235 isotope?

Here the process will go differently: the neutrons released during the fission of several nuclei, in turn, falling into neighboring nuclei, cause their fission. As a result, a new portion of neutrons is released, which splits the following nuclei. Under favorable conditions, this reaction proceeds like an avalanche and is called a chain reaction. A few bombarding particles may suffice to start it.

Indeed, let only 100 neutrons bombard uranium-235. They will split 100 uranium nuclei. In this case, 250 new neutrons of the second generation will be released (an average of 2.5 per fission). The neutrons of the second generation will already produce 250 fissions, at which 625 neutrons will be released. In the next generation it will be 1562, then 3906, then 9670, and so on. The number of divisions will increase without limit if the process is not stopped.

However, in reality, only an insignificant part of neutrons gets into the nuclei of atoms. The rest, swiftly rushing between them, are carried away into the surrounding space. A self-sustaining chain reaction can only occur in a sufficiently large array of uranium-235, which is said to have a critical mass. (This mass under normal conditions is 50 kg.) It is important to note that the fission of each nucleus is accompanied by the release of a huge amount of energy, which turns out to be about 300 million times more than the energy spent on fission! (It has been calculated that with the complete fission of 1 kg of uranium-235, the same amount of heat is released as when burning 3 thousand tons of coal.)

This colossal surge of energy, released in a matter of moments, manifests itself as an explosion of monstrous force and underlies the operation of nuclear weapons. But in order for this weapon to become a reality, it is necessary that the charge does not consist of natural uranium, but of a rare isotope - 235 (such uranium is called enriched). Later it was found that pure plutonium is also a fissile material and can be used in an atomic charge instead of uranium-235.

All these important discoveries were made on the eve of World War II. Soon in Germany and in other countries, secret work began on the creation of an atomic bomb. In the United States, this problem was taken up in 1941. The whole complex of works was given the name of the "Manhattan Project".

The administrative leadership of the project was carried out by General Groves, and the scientific direction was carried out by Professor Robert Oppenheimer of the University of California. Both were well aware of the enormous complexity of the task before them. Therefore, Oppenheimer's first concern was the acquisition of a highly intelligent scientific team. In the United States at that time there were many physicists who had emigrated from fascist Germany. It was not easy to involve them in the creation of weapons directed against their former homeland. Oppenheimer spoke to everyone personally, using the full force of his charm. Soon he managed to gather a small group of theorists, whom he jokingly called "luminaries." And in fact, it included the largest experts of that time in the field of physics and chemistry. (Among them are 13 Nobel Prize winners, including Bohr, Fermi, Frank, Chadwick, Lawrence.) In addition to them, there were many other specialists of various profiles.

The US government did not skimp on spending, and from the very beginning the work assumed a grandiose scope. In 1942, the world's largest research laboratory was founded at Los Alamos. The population of this scientific city soon reached 9 thousand people. In terms of the composition of scientists, the scope of scientific experiments, the number of specialists and workers involved in the work, the Los Alamos Laboratory had no equal in world history. The Manhattan Project had its own police, counterintelligence, communications system, warehouses, settlements, factories, laboratories, and its own colossal budget.

The main goal of the project was to obtain enough fissile material from which to create several atomic bombs. In addition to uranium-235, as already mentioned, the artificial element plutonium-239 could serve as a charge for the bomb, that is, the bomb could be either uranium or plutonium.

Groves and Oppenheimer agreed that work should be carried out simultaneously in two directions, since it is impossible to decide in advance which of them will be more promising. Both methods were fundamentally different from each other: the accumulation of uranium-235 had to be carried out by separating it from the bulk of natural uranium, and plutonium could only be obtained as a result of a controlled nuclear reaction by irradiating uranium-238 with neutrons. Both paths seemed unusually difficult and did not promise easy solutions.

Indeed, how can two isotopes be separated from each other, which differ only slightly in their weight and chemically behave in exactly the same way? Neither science nor technology has ever faced such a problem. Plutonium production also seemed very problematic at first. Prior to this, the entire experience of nuclear transformations was reduced to several laboratory experiments. Now it was necessary to master the production of kilograms of plutonium on an industrial scale, develop and create a special installation for this - a nuclear reactor, and learn how to control the course of a nuclear reaction.

And here and there it was necessary to resolve a whole complex challenging tasks. Therefore, the "Manhattan Project" consisted of several subprojects, headed by prominent scientists. Oppenheimer himself was the head of the Los Alamos Science Laboratory. Lawrence was in charge of the Radiation Laboratory at the University of California. Fermi led research at the University of Chicago on the creation of a nuclear reactor.

Initially, the most important problem was obtaining uranium. Before the war, this metal actually had no use. Now that it was needed immediately in huge quantities, it turned out that there was no industrial way to produce it.

The Westinghouse company undertook its development and quickly achieved success. After purification of uranium resin (in this form uranium occurs in nature) and obtaining uranium oxide, it was converted into tetrafluoride (UF4), from which metallic uranium was isolated by electrolysis. If at the end of 1941 American scientists had only a few grams of metallic uranium at their disposal, then already in November 1942 its industrial production at the Westinghouse plants reached 6,000 pounds per month.

At the same time, work was underway on the creation of a nuclear reactor. The plutonium production process actually boiled down to the irradiation of uranium rods with neutrons, as a result of which part of the uranium-238 had to turn into plutonium. Sources of neutrons in this case could be fissile uranium-235 atoms scattered in sufficient quantities among uranium-238 atoms. But in order to maintain a constant reproduction of neutrons, a chain reaction of fission of uranium-235 atoms had to begin. Meanwhile, as already mentioned, for every atom of uranium-235 there were 140 atoms of uranium-238. It is clear that the neutrons flying in all directions were much more likely to meet exactly them on their way. That is, a huge number of released neutrons turned out to be absorbed by the main isotope to no avail. Obviously, under such conditions, the chain reaction could not go. How to be?

At first it seemed that without the separation of two isotopes, the operation of the reactor was generally impossible, but one important circumstance was soon established: it turned out that uranium-235 and uranium-238 were susceptible to neutrons of different energies. It is possible to split the nucleus of an atom of uranium-235 with a neutron of relatively low energy, having a speed of about 22 m/s. Such slow neutrons are not captured by uranium-238 nuclei - for this they must have a speed of the order of hundreds of thousands of meters per second. In other words, uranium-238 is powerless to prevent the start and progress of a chain reaction in uranium-235 caused by neutrons slowed down to extremely low speeds - no more than 22 m/s. This phenomenon was discovered by the Italian physicist Fermi, who lived in the United States since 1938 and supervised the work on the creation of the first reactor here. Fermi decided to use graphite as a neutron moderator. According to his calculations, the neutrons emitted from uranium-235, having passed through a layer of graphite of 40 cm, should have reduced their speed to 22 m/s and started a self-sustaining chain reaction in uranium-235.

The so-called "heavy" water could serve as another moderator. Since the hydrogen atoms that make up it are very close in size and mass to neutrons, they could best slow them down. (About the same thing happens with fast neutrons as with balls: if a small ball hits a large one, it rolls back, almost without losing speed, but when it meets a small ball, it transfers a significant part of its energy to it - just like a neutron in an elastic collision bounces off a heavy nucleus only slightly slowing down, and on collision with the nuclei of hydrogen atoms very quickly loses all its energy.) However, ordinary water is not suitable for slowing down, since its hydrogen tends to absorb neutrons. That is why deuterium, which is part of "heavy" water, should be used for this purpose.

In early 1942, under the leadership of Fermi, construction began on the first ever nuclear reactor in the tennis court under the west stands of the Chicago Stadium. All work was carried out by the scientists themselves. The reaction can be controlled in the only way - by adjusting the number of neutrons involved in the chain reaction. Fermi envisioned doing this with rods made from materials such as boron and cadmium, which absorb neutrons strongly. Graphite bricks served as a moderator, from which physicists erected columns 3 m high and 1.2 m wide. Rectangular blocks with uranium oxide were installed between them. About 46 tons of uranium oxide and 385 tons of graphite went into the entire structure. To slow down the reaction, cadmium and boron rods introduced into the reactor served.

If this weren't enough, then for insurance, on a platform located above the reactor, there were two scientists with buckets filled with a solution of cadmium salts - they were supposed to pour them on the reactor if the reaction got out of control. Fortunately, this was not required. On December 2, 1942, Fermi ordered all the control rods to be extended, and the experiment began. Four minutes later, the neutron counters began to click louder and louder. With every minute, the intensity of the neutron flux became greater. This indicated that a chain reaction was taking place in the reactor. It went on for 28 minutes. Then Fermi signaled, and the lowered rods stopped the process. Thus, for the first time, man released the energy of the atomic nucleus and proved that he could control it at will. Now there was no longer any doubt that nuclear weapons were a reality.

In 1943, the Fermi reactor was dismantled and transported to the Aragonese National Laboratory (50 km from Chicago). Was here shortly
another nuclear reactor was built, in which heavy water was used as a moderator. It consisted of a cylindrical aluminum tank containing 6.5 tons of heavy water, into which 120 rods of uranium metal were vertically loaded, enclosed in an aluminum shell. The seven control rods were made from cadmium. Around the tank was a graphite reflector, then a screen made of lead and cadmium alloys. The entire structure was enclosed in a concrete shell with a wall thickness of about 2.5 m.

Experiments at these experimental reactors confirmed the possibility of commercial production of plutonium.

The main center of the "Manhattan Project" soon became the town of Oak Ridge in the Tennessee River Valley, whose population in a few months grew to 79 thousand people. Here, in a short time, the first plant for the production of enriched uranium was built. Immediately in 1943, an industrial reactor was launched that produced plutonium. In February 1944, about 300 kg of uranium was extracted from it daily, from the surface of which plutonium was obtained by chemical separation. (To do this, the plutonium was first dissolved and then precipitated.) The purified uranium was then returned to the reactor again. In the same year, in the barren, desolate desert on the south bank of the Columbia River, construction began on the huge Hanford Plant. Three powerful nuclear reactors were located here, giving several hundred grams of plutonium daily.

At the same time, research was in full swing to develop industrial process uranium enrichment.

Having considered different variants, Groves and Oppenheimer decided to focus on two methods: gas diffusion and electromagnetic.

The gas diffusion method was based on a principle known as Graham's law (it was first formulated in 1829 by the Scottish chemist Thomas Graham and developed in 1896 English physicist Reilly). In accordance with this law, if two gases, one of which is lighter than the other, are passed through a filter with negligibly small openings, then several more easy gas than heavy gas. In November 1942, Urey and Dunning at Columbia University created a gaseous diffusion method for separating uranium isotopes based on the Reilly method.

Since natural uranium is a solid, it was first converted to uranium fluoride (UF6). This gas was then passed through microscopic - on the order of thousandths of a millimeter - holes in the filter septum.

Since the difference in the molar weights of the gases was very small, behind the baffle the content of uranium-235 increased only by a factor of 1.0002.

In order to increase the amount of uranium-235 even more, the resulting mixture is again passed through a partition, and the amount of uranium is again increased by 1.0002 times. Thus, in order to increase the content of uranium-235 to 99%, it was necessary to pass the gas through 4000 filters. This took place in a huge gaseous diffusion plant at Oak Ridge.

In 1940, under the leadership of Ernst Lawrence at the University of California, research began on the separation of uranium isotopes by the electromagnetic method. It was necessary to find such physical processes, which would allow isotopes to be separated using the difference in their masses. Lawrence made an attempt to separate isotopes using the principle of a mass spectrograph - an instrument that determines the masses of atoms.

The principle of its operation was as follows: pre-ionized atoms were accelerated by an electric field, and then passed through a magnetic field in which they described circles located in a plane perpendicular to the direction of the field. Since the radii of these trajectories were proportional to the mass, the light ions ended up on circles of a smaller radius than the heavy ones. If traps were placed in the path of the atoms, then it was possible in this way to separately collect different isotopes.

That was the method. Under laboratory conditions, he gave good results. But the construction of a plant in which isotope separation could be carried out on an industrial scale proved to be extremely difficult. However, Lawrence eventually managed to overcome all difficulties. The result of his efforts was the appearance of the calutron, which was installed in a giant plant in Oak Ridge.

This electromagnetic plant was built in 1943 and turned out to be perhaps the most expensive brainchild of the Manhattan Project. Lawrence's method required a large number of complex, not yet developed devices related to high voltage, high vacuum and strong magnetic fields. The costs were enormous. Calutron had a giant electromagnet, the length of which reached 75 m and weighed about 4000 tons.

Several thousand tons of silver wire went into the windings for this electromagnet.

The entire work (excluding the cost of $300 million worth of silver, which the State Treasury provided only temporarily) cost $400 million. Only for the electricity spent by the calutron, the Ministry of Defense paid 10 million. Much of the equipment at the Oak Ridge factory was superior in scale and precision to anything ever developed in the field.

But all these expenses were not in vain. Cost in total about 2 billion dollars, US scientists by 1944 created a unique technology for uranium enrichment and plutonium production. Meanwhile, at the Los Alamos Laboratory, they were working on the design of the bomb itself. The principle of its operation was in general terms clear for a long time: the fissile substance (plutonium or uranium-235) should have been transferred to a critical state at the time of the explosion (for a chain reaction to occur, the mass of the charge must be even noticeably larger than the critical one) and irradiated with a neutron beam, which entailed is the start of a chain reaction.

According to calculations, the critical mass of the charge exceeded 50 kilograms, but it could be significantly reduced. In general, the magnitude of the critical mass is strongly influenced by several factors. The larger the surface area of ​​the charge, the more neutrons radiated uselessly into the surrounding space. A sphere has the smallest surface area. Therefore, spherical charges for other equal conditions have the lowest critical mass. In addition, the value of the critical mass depends on the purity and type of fissile materials. It is inversely proportional to the square of the density of this material, which allows, for example, by doubling the density, to reduce the critical mass by a factor of four. The required degree of subcriticality can be obtained, for example, by compacting the fissile material due to the explosion of a conventional explosive charge made in the form of a spherical shell surrounding the nuclear charge. The critical mass can also be reduced by surrounding the charge with a screen that reflects neutrons well. Lead, beryllium, tungsten, natural uranium, iron, and many others can be used as such a screen.

One of the possible designs of the atomic bomb consists of two pieces of uranium, which, when combined, form a mass greater than the critical one. In order to cause a bomb explosion, you need to bring them together as quickly as possible. The second method is based on the use of an inward-converging explosion. In this case, the flow of gases from a conventional explosive was directed at the fissile material located inside and compressing it until it reached a critical mass. The connection of the charge and its intense irradiation with neutrons, as already mentioned, causes a chain reaction, as a result of which, in the first second, the temperature rises to 1 million degrees. During this time, only about 5% of the critical mass managed to separate. The rest of the charge in early bomb designs evaporated without
any good.

The first atomic bomb in history (it was given the name "Trinity") was assembled in the summer of 1945. And on June 16, 1945, the first atomic explosion on Earth was carried out at the nuclear test site in the Alamogordo desert (New Mexico). The bomb was placed in the center of the test site on top of a 30-meter steel tower. Recording equipment was placed around it at a great distance. At 9 km there was an observation post, and at 16 km - a command post. The atomic explosion made a tremendous impression on all the witnesses of this event. According to the description of eyewitnesses, there was a feeling that many suns merged into one and lit up the polygon at once. Then a huge ball of fire appeared above the plain, and a round cloud of dust and light began to slowly and ominously rise towards it.

After taking off from the ground, this fireball flew up to a height of more than three kilometers in a few seconds. With every moment it grew in size, soon its diameter reached 1.5 km, and it slowly rose into the stratosphere. Then the fireball gave way to a column of swirling smoke, which stretched to a height of 12 km, taking the form giant mushroom. All this was accompanied by a terrible roar, from which the earth trembled. The power of the exploded bomb exceeded all expectations.

As soon as the radiation situation allowed, several Sherman tanks, lined with lead plates from the inside, rushed into the explosion area. On one of them was Fermi, who was eager to see the results of his work. Dead scorched earth appeared before his eyes, on which all life was destroyed within a radius of 1.5 km. The sand sintered into a glassy greenish crust that covered the ground. In a huge crater lay the mutilated remains of a steel support tower. The force of the explosion was estimated at 20,000 tons of TNT.

The next step was to be combat use bombs against Japan, which, after the surrender of fascist Germany, alone continued the war with the United States and its allies. There were no launch vehicles then, so the bombing had to be carried out from an aircraft. The components of the two bombs were transported with great care by the USS Indianapolis to Tinian Island, where the US Air Force 509th Composite Group was based. By type of charge and design, these bombs were somewhat different from each other.

The first bomb - "Baby" - was a large-sized aerial bomb with an atomic charge of highly enriched uranium-235. Its length was about 3 m, diameter - 62 cm, weight - 4.1 tons.

The second bomb - "Fat Man" - with a charge of plutonium-239 had an egg shape with a large-sized stabilizer. Its length
was 3.2 m, diameter 1.5 m, weight - 4.5 tons.

On August 6, Colonel Tibbets' B-29 Enola Gay bomber dropped the "Kid" on the large Japanese city of Hiroshima. The bomb was dropped by parachute and exploded, as it was planned, at an altitude of 600 m from the ground.

The consequences of the explosion were terrible. Even on the pilots themselves, the sight of the peaceful city destroyed by them in an instant made a depressing impression. Later, one of them admitted that they saw at that moment the worst thing that a person can see.

For those who were on earth, what was happening looked like a real hell. First of all, a heat wave passed over Hiroshima. Its action lasted only a few moments, but it was so powerful that it melted even tiles and quartz crystals in granite slabs, turned telephone poles into coal at a distance of 4 km and, finally, so incinerated human bodies that only shadows remained of them on the pavement asphalt. or on the walls of houses. Then from under fireball a monstrous gust of wind broke out and rushed over the city at a speed of 800 km / h, sweeping away everything in its path. The houses that could not withstand his furious onslaught collapsed as if they had been cut down. In a giant circle with a diameter of 4 km, not a single building remained intact. A few minutes after the explosion, a black radioactive rain passed over the city - this moisture turned into steam condensed in the high layers of the atmosphere and fell to the ground in the form of large drops mixed with radioactive dust.

After the rain, a new gust of wind hit the city, this time blowing in the direction of the epicenter. He was weaker than the first, but still strong enough to uproot trees. The wind fanned a gigantic fire in which everything that could burn was burning. Of the 76,000 buildings, 55,000 were completely destroyed and burned down. Witnesses of this terrible catastrophe recalled people-torches from which burnt clothes fell to the ground along with tatters of skin, and crowds of distraught people, covered with terrible burns, who rushed screaming through the streets. There was a suffocating stench in the air from the burning human meat. People lay everywhere, dead and dying. There were many who were blind and deaf and, poking in all directions, could not make out anything in the chaos that reigned around.

The unfortunate, who were from the epicenter at a distance of up to 800 m, burned out in a split second in the literal sense of the word - their insides evaporated, and their bodies turned into lumps of smoking coals. Located at a distance of 1 km from the epicenter, they were struck by radiation sickness in an extremely severe form. Within a few hours, they began to vomit severely, the temperature jumped to 39-40 degrees, shortness of breath and bleeding appeared. Then, non-healing ulcers appeared on the skin, the composition of the blood changed dramatically, and the hair fell out. After terrible suffering, usually on the second or third day, death occurred.

In total, about 240 thousand people died from the explosion and radiation sickness. About 160 thousand received radiation sickness in a milder form - their painful death was delayed for several months or years. When the news of the catastrophe spread throughout the country, all of Japan was paralyzed with fear. It increased even more after Major Sweeney's Box Car aircraft dropped a second bomb on Nagasaki on August 9th. Several hundred thousand inhabitants were also killed and wounded here. Unable to resist the new weapons, the Japanese government capitulated - the atomic bomb put an end to World War II.

War is over. It lasted only six years, but managed to change the world and people almost beyond recognition.

Human civilization before 1939 and human civilization after 1945 are strikingly different from each other. There are many reasons for this, but one of the most important is the emergence of nuclear weapons. It can be said without exaggeration that the shadow of Hiroshima lies over the entire second half of the 20th century. It became a deep moral burn for many millions of people, both those who were contemporaries of this catastrophe and those born decades after it. Modern man can no longer think about the world the way it was thought before August 6, 1945 - he understands too clearly that this world can turn into nothing in a few moments.

A modern person cannot look at the war, as his grandfathers and great-grandfathers watched - he knows for sure that this war will be the last, and there will be neither winners nor losers in it. Nuclear weapon left its mark on all spheres public life, and modern civilization cannot live by the same laws as sixty or eighty years ago. No one understood this better than the creators of the atomic bomb themselves.

"People of our planet Robert Oppenheimer wrote, should unite. The horror and destruction sown by the last war dictate this thought to us. Explosions of atomic bombs proved it with all cruelty. Other people at other times have said similar words - only about other weapons and other wars. They didn't succeed. But whoever says today that these words are useless is deceived by the vicissitudes of history. We cannot be convinced of this. The results of our labor leave no other choice for humanity but to create a unified world. A world based on law and humanism."