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However it was discovered that plutonium created for the bomb in the nuclear reactors at Hanford, Washington, was not as pure as the initial samples of digital photography plutonium developed at the cyclotrons at UC Berkeley. Because of the presence of the isotope Pu-240, reactor-bred plutonium had a much higher rate digital photography of spontaneous neutron emission than was previously thought, and if a gun-type device was used it would most likely pre-detonate and result in a messy and costly "fizzle". After this problem was realized in 1943, work began in earnest on digital photography the implosion bomb, the "Fat Man". It is theoretically possible to build a plutonium gun-type device, but it would need to be 19 feet long in order to allow the sub-critical masses to be fused into a critical mass before a fizzle occurs. The mass of a plutonium gun-type device would have been beyond the payload of the B-29.The gun-type method could still be used for highly-enriched uranium, though, and was employed in the "Little Boy" weapon which was used against Hiroshima, Japan.
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