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No nuclear weapons were used in the Japanese attack on Pearl Harbor on December 7, 1941 as such weapons did not exist and would not exist until July 1945 when the US built the first ones. The first use of a nuclear weapon in war was the US attack on Hiroshima on August 6, 1945; the bomb was a relatively simple and very inefficient (~1%) fast fission neutron chain reaction Uranium-235 (80% enrichment) gun bomb.

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8y ago

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