Little Boy

This weapon casing is identical to that used for the Little Boy atomic bomb. Little Boy was the first nuclear weapon applied to warfare. Little Boy exploded approximately 1,800 feet over Hiroshima, Japan on the morning of August 6, 1945. Immediate deaths were estimated between 70,000 and 130,000.

Little Boy was a gun-type device. A sub-critical piece of uranium (U-235) was placed at each end of a large gun barrel. When the bomb was detonated, a high explosive charge drove one piece of U-235 down the barrel till it joined with the other piece of U-235. A super-critical mass resulted. This produced an explosion with the power (yield) of approximately 13,000 tons of TNT.

Length	10 feet (3.48 m)
Diameter	28 inches (0.71 m)
Weight	8,900 pounds (4036 kg)
Yield	13 kilotons

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