Uranium is the element with the highest atomic number existing in nature. 184 1 year E. Paley (181-1890) separates metallic uranium, although uranium has been recognized in pitchblende before. It is also hidden in mica uranium ore, vanadium-potassium uranium ore and monazite; Mainly distributed in Canada, Australia and South Africa. Isotopic uranium can be separated from volatile gas UF6 by gas diffusion technology.
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The emergence of nuclear weapons is the result of the great development of science and technology around the 1940s. At the beginning of 1939, German chemist O. Hahn and physical chemist F. Strassman published papers on nuclear fission of uranium atoms. Within a few weeks, scientists from many countries verified this discovery and further suggested that it was possible to create conditions for this fission reaction to proceed on its own, thus opening up a broad prospect of using this new energy to create wealth for mankind.
However, like many new scientific and technological discoveries in history, the development of nuclear energy was first used for military purposes, that is, to make a powerful atomic bomb, and its process was influenced and restricted by social and political conditions at that time.
Since 1939, it has become increasingly difficult for many European countries to carry out scientific research due to the expansion of the fascist German war of aggression. At the beginning of September of the same year, Danish physicist N.H.D Bohr and his collaborator J.A. Wheeler theoretically expounded the process of nuclear fission reaction, and pointed out that the best element that can cause this reaction is the isotope uranium 235.
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