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Atomic Bomb On August 2 1939 Albert Einstein wrote to President Franklin D Roosevelt This was right before the start of World War 2 In this letter Einstein and several other scientists told Roosevelt of the efforts Hitler was making to purify U-235 in which he hoped to make an atomic bomb This is when the United States started the Manhattan Project This was the project of making an atomic bomb In the project many brilliant minds were used The most famous of these people is Robert Oppenheimer He was the major person behind this project He basically ran the operation and oversaw the hole project from start to completion Other great people like HC Urey Ernest Lawrence Isidor Rabi and Ken Bainbridge also worked on the project and put just as much into it The most complicated process was the process of getting enough uranium to sustain a chain reaction In that time it was very hard to extract U-235 The ration of Uranium ore to the Uranium metal is 5001 Then out of this Uranium metal 99 of it is U-238 which is non-fissionable Finding a process to refining the Uranium was the first step in developing the atomic bomb A massive enrichment laboratoryplant was built in Oak ridge Tennessee HC Urey and other associates at Columbia University devised a system that separated the Uranium using the principle of gaseous diffusion Ernest Lawrence shortly following this invention came up with a process using magnetic separation This process was quicker then the first After the Uranium metal was separated form the Uranium ore it is put into a gas centrifuge to separate the U-235 and U-238 The first step of building an atomic bomb was completed They now had the U-235 to build a bomb Over the course of six years 1939-1945 scientist worked on equations to make the U-235 into a bomb It took some of the greatest minds
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