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It used 2 pieces of 93.5% enriched Uranium-235: the target and the bullet at opposite ends of a cannon barrel. Cordite propelled the bullet down the barrel to the target. Once at the target, creating a supercritical mass, the bullet crushed the neutron source which generated a pulse of neutrons (about 10 in the time to set off the bomb).

For more details see The Making of the Atomic Bomb by Richard Rhodes.

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13y ago

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