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The first site period film chosen was a “virgin” site for period film the bomb - one in which the actual power of the bomb could be accessed. Little Boy Uranium Dropped on Hiroshima August 6, 1945 How it works In essence, the Little Boy design consisted of a gun that fired one mass of uranium 235 period film at another mass of uranium 235, thus creating a supercritical mass. A crucial requirement was that the pieces be brought together in a time shorter than the time between spontaneous fissions. Once the two pieces of uranium are brought together, the initiator introduces a burst of neutrons and the chain reaction begins, continuing until the energy released becomes so great that the bomb simply blows itself apart. Impact The uranium bomb, Little Boy, exploded at 8:16 a.m. Hiroshima time 43 seconds after it left the B-29 Enola Gay almost 2,000 feet above the ground. It had a yield equivalent to 20,000 tons of TNT.
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