Manhattan Project


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Manhattan Project

  1. 1. The Manhattan Project ~A top secret U.S. project
  2. 2. The Manhattan Project oSecret program from 1942-1946 in the U.S. focusing on building the first atomic bomb oEven Harry S. Truman did not know about the project until Roosevelt’s death in 1945.
  3. 3. Goals… oto develop the atomic bomb before Germany or Japan did oIn order to end WWII oTo show it off to the world The race was on…
  4. 4. They were able to work toward building the atomic bomb through achievements in the area of nuclear physics, including the discovery of fission. They used the idea of fission, the separation of an atom, to build their atomic bombs.
  5. 5. oMany scientists were involved in the Manhattan Project such as Albert Einstein, Enrico Fermi, and Robert Oppenheimer. oOppenheimer was in charge of the project along with General Leslie R. Groves. oThe Nazis made the mistake of exiling their Jewish scientists, and they then went to the U.S. and helped them build nuclear weapons.
  6. 6. Einstein: Involvement in the Project Einstein came from Germany to the U.S. He wrote a letter to President Roosevelt that was received on August 2, 1939. Warned him of Germany’s advances within nuclear physics and research involving the atomic bomb Warned of attempts at building nuclear weapons
  7. 7. Over 30 different sites but the main 3 centers for the Manhattan Project were: Los Alamos, New Mexico (assembled nuclear weapons) Oak Ridge, Tennessee (produced uranium- 235) Hanford, Washington (produced weapons- grade plutonium)
  8. 8. The Atomic Bombs The Scientists for the Manhattan Project built a test bomb and the two bombs that were dropped in Japan. “Gadget” which was the test bomb and was plutonium based “Little Boy” which was dropped in Hiroshima and was uranium based “Fat Man” which was dropped in Nagasaki and was plutonium based
  9. 9. Some Key Events May 12, 1942~Roosevelt signs an order to create the Manhattan Project April, 1943~ Bomb design begins in Los Alamos 1944~Uranium, gun-style bomb is determined to be reliable July 16, 1945~ experience the first atomic bomb during a trial August 6, 1945~Little Boy was dropped August 9, 1945~Fat Man was dropped
  10. 10. Controversy The scientists had opposing views on the use of the atomic bomb. Some felt that it should not be used for ethical reasons. Others felt that it needed to be used as a defense mechanism against Japan. However, the decision was not up to them. It was left to Harry S. Truman.
  11. 11. Overall Achievements Pros Cons The Manhattan It led to massive Project allowed death and a scientists to make terrible aftermath new discoveries of WWII. about the atom. It became the most destructive It allowed the U.S. to become type of warfare one of the leading known to mankind. nations in the development of nuclear weapons.
  12. 12. Sources American Nation in the Modern Era. New York: Holt, Rinehart and Winston, 2005. quot;The Manhattan Project: An Interactive History.quot; Department of Energy - CFO Home. 20 Apr. 2009. <>. quot;Key Issues: Nuclear Weapons: History: Pre Cold War: Manhattan Project.quot; Nuclear Files - From nuclear proliferation to nuclear testing, from Hiroshima to North Korea, Nuclear Files offers the A to Z on nuclear issues. 26 Apr. 2009. < issues/nuclear-weapons/history/pre-cold-war/manhattan- project/>. quot;The Manhattan Project.quot; Travel and History. 26 Apr. 2009. <>.