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In the fall of 2002, a group of scientists at los alamos national laboratory determined that the critical mass of neptunium-237 is about 60.0kg. the critical mass of a fissionable material is the minimum amount that must be brought together to start a chain reaction. neptunium-237 has a density of 19.5g/cm3.
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In the fall of 2002, a group of scientists at los alamos national laboratory determined that the cri...
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