"Depleted uranium is slightly more radioactive." Interesting. It should be dramatically less radioactive than pure, natural uranium. It's the part that's left over after the really radioactive part is removed. U-238 doesn't become radioactive from just being exposed to U-235 (which is why it isn't that useful in bombs or reactors, it's too stable) and I can't imagine any reason just extracting it would make it more radioactive.
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