Little Boy on Tinian
In essence, the Little Boy design consisted of a gun that fired one mass of uranium 235 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.
Little Boy Specifications
|Length:||120.0 inches (10 feet / 3.0 meters)|
|Diameter:||28.0 inches (71.1 cm)|
|Weight:||9,700 lbs (4,400 kg)|
|Yield:||15 kiltons (+/- 20%)|