Hiroshima atomic bomb with highly concentrated uranium 235 exposed the super destructive energy by nuclear fission chain reaction

　USA invested $ 2 billion in the Manhattan plan to complete the atomic bomb before the end of the Pacific War and concluded it from September 1942. It needed slightly 500 million dollars for the electromagnetic separation method and 500 million dollars for the gas diffusion method to produce highly enrich uranium 235, for the  explosive material of the Hiroshima atomic bomb. Uranium 235 was low concentrated from gas diffusion method until March 1945. 50 kg of highly enriched uranium 235 could be supplied by the electromagnetic separation method in time before August 1945. 

 Compared to the uranium process, the explosive device of Hiroshima atomic bomb could be easily developed and produced. The uranium 235 were separated into a shell-like part and a ring-shaped part. After they crashed by TNT, Neutrons were generated and the super destructive energy could be exposed by the nuclear fission and chain reaction within uranium 235.