Manhattan Project And The A

Manhattan Project And The A-Bomb Essay Just before the beginning of World War II, Albert Einstein wrote a letter to President Franklin D. Roosevelt. Urged by Hungarian-born physicists Leo Szilard, Eugene Wingner, and Edward Teller, Einstein told Roosevelt about Nazi German efforts to purify Uranium-235 which might be used to build an atomic bomb. Shortly after that the United States Government began work on the Manhattan Project. The Manhattan Project was the code name for the United States effort to develop the atomic bomb before the Germans did. The first successful experiments in splitting a uranium atom had been carried out in the autumn of 1938 at the Kaiser Wilhelm Institute in Berlin(Groueff 9) just after Einstein wrote his letter. So the race was on. Major General Wilhelm D. Styer called the Manhattan Project the most important job in the war . . . an all-out effort to build an atomic bomb.(Groueff 5) It turned out to be the biggest development in warfare and sciences biggest development this century. The most complicated issue to be addressed by the scientists working on the Manhattan Project was the production of ample amounts of enriched uranium to sustain a chain reaction.(Outlaw 2) At the time, Uranium-235 was hard to extract. Of the Uranium ore mined, only about 1/500 th of it ended up as Uranium metal. Of the Uranium metal, the fissionable isotope of Uranium (Uranium- 235) is relatively rare, occurring in Uranium at a ratio of 1 to 139.(Szasz 15) Separating the one part Uranium-235 from the 139 parts Uranium-238 proved to be a challenge. No ordinary chemical extraction could separate the two isotopes. Only mechanical methods could effectively separate U-235 from U-238.(2) Scientists at Columbia University solved this difficult problem. A massive enrichment laboratory/plant(Outlaw 2) was built at Oak Ridge, Tennessee. H. C. Urey, his associates, and colleagues at Columbia University designed a system that worked on the principle of gaseous diffusion.(2) After this process was completed, Ernest O. Lawrence (inventor of the Cyclotron) at the University of California in Berkeley implemented a process involving magnetic separation of the two isotopes. (2) Finally, a gas centrifuge was used to further separate the Uranium-235 from the Uranium-238. The Uranium-238 is forced to the bottom because it had more mass than the Uranium-235. In this manner uranium-235 was enriched from its normal 0.7% to weapons grade of more than 90%. (Grolier 5) This Uranium was then transported to the Los Alamos, N. Mex., laboratory headed by J. Robert Oppenheimer. (Grolier 5) Oppenheimer was the major force behind the Manhattan Project. He literally ran the show and saw to it that all of the great minds working on this project made their brainstorms work. He oversaw the entire project from its conception to its completion.(Outlaw 3) Once the purified Uranium reached New Mexico, it was made into the components of a gun-type atomic weapon. Two pieces of U-235, individually not large enough to sustain a chain reaction, were brought together rapidly in a gun barrel to form a supercritical mass that exploded ineztaneously.(Grolier 5) It was originally nicknamed Thin Man'(after Roosevelt, but later renamed Little Boy (for nobody) when technical changes shortened the proposed gun barrel.(Szasz 25) The scientists were so confident that the gun-type atomic bomb would work no test was conducted, and it was first employed in military action over Hiroshima, Japan, on Aug. 6, 1945. (Grolier 5) Before the Uranium-235 Little Boy bomb had been developed to the point of seeming assured of success,(Grolier 5) another bomb was proposed. The Uranium-238 that had been earlier ruled out as an option was being looked at. It could capture a free neutron without fissioning and become Uranium-239. But the Uranium-239 thus produced is unstable (radioactive) and decays first to neptunium-239 and then to plutonium-239. Drunk Driving(Interlock) Essay No man-made phenomenon of such tremendous power had ever occurred before . . . Thirty seconds after the explosion came, first, the air blast pressing hard against people and things, to be followed almost immediately by the strong, sustained, awesome roar which warned of doomsday and made us feel that we puny things were blasphemous to dare tamper with forces heretofore reserved to the Almighty. Words are inadequate tools for the job of acquainting those not present with the physical, mental and psychological effects.(Groueff 355) Upon witnessing the explosion, reactions among the bombs creators were mixed. Their mission had been successfully accomplished, however, they questioned whether the equilibrium in nature had been upset as if humankind had become a threat to the world it inhabited.(Outlaw 3) Oppenheimer was ecstatic about the success of the bomb, but quoted a fragment from Bhagavad Gita. I am become Death, the destroyer of worlds. Many people who were involved in the creation of the atomic bomb signed petitions against dropping the bomb. The atomic bomb has been used twice in warfare. The Uranium bomb nicknamed Little Boy, which weighed over 4. 5 tons, was dropped over Hiroshima on August 6, 1945. At 0815 hours the bomb was dropped from the Enola Gay. It missed Ground Zero at 1,980 feet by only 600 feet. At 0816 hours, in the flash of an inezt, 66,000 people were killed and 69,000 people were injured by a 10 kiloton atomic explosion. (Outlaw 4) Nagasaki fell to the same treatment as Hiroshima on August 9, 1945. The plutonium bomb, Fat Man, was dropped on the city. It missed its intended target by over one and a half miles. Nagasakis population dropped in one split-second from 422,000 to 383,000. 39,000 were killed, over 25,000 were injured. That blast was less than 10 kilotons as well. Physicists who have studied the atomic explosions conclude that the bombs utilized only 0.1% of their respective explosive capabilities. (Outlaw 4) Controversy still exists about dropping the two atomic bombs on Japan. Arguments defending the Japanese claim the atomic bomb did not win the war in the Pacific; at best, it hastened Japanese acceptance of a defeat that was viewed as inevitable.(Grolier 8) Other arguments state that the United States should have warned the Japanese, or that we should have invited them to a public demonstration. In retrospect that U. S. use of the atomic bomb may have been the first act of the cold war.(Grolier 8) On the other side, advocates claimed that the invasion of the Japanese islands could and would result in over one million military casualties plus the civilian losses based on previous invasions of Japanese occupied islands.