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  Key Issues Nuclear Weapons History Pre Cold War Manhattan Project Little Boy

Little Boy

Little Boy was one of the four nuclear weapons produced by the Manhattan Project at Los Alamos. It was the first atomic bomb ever used in combat. On 6 August 1945, the US plane Enola Gay dropped Little Boy approximately 1,800 feet over Hiroshima, Japan, with a force equal to 13,000

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tons of TNT. Immediate deaths were between 70,000 to 130,000.

Little Boy was a gun-type uranium-235 weapon, 10 feet in length, 28 inches wide and weighted 8,900 lb . It fired one subcritical piece of uranium-235 into another subcritical piece of uranium-235, which caused a nuclear chain reaction.