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fuel rods, assuming they were able to perform the extremely difficult task of separation from highly irradiated fuel which contained 69 elements, they would only have 41 kg of U-235, less than the 64 kg used in Little Boy. 52 kg of 93% enriched uranium is the minimum critical mass required to create a uranium bomb. They did not have the technical capabilities or resources to produce an implosion type device that uses less

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