They were not so sure about the more complex "Fat Man" plutonium bomb, so they tested it in the desert of Alamogordo, New Mexico, before dropping one on Nagasaki on Aug. 9.
The material that went into Fat Man, the plutonium bomb detonated over Nagasaki, was made at Hanford, which at its peak consisted of nine nuclear reactors and five plutonium reprocessing plants.