cocomo
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Very elegantly explained. I like how you just ignored the other 15% required non-purified Uranium because I suspect it would be acquired from previously processed 130 tons (-910 kg) of uranium. Bravo.A Fat-Man-type fission bomb requires a 56 kg core and roughly 85% purity (in terms of U-235). This implies that each "warhead" would require a minimum of (56)(0.85) = 48 kg of highly-enriched U-235.