By Allison Macfarlane, Frank von Hippel, Jungmin Kang, Robert Nelson | May 1, 2001
If all the “excess” plutonium from dismantled weapons were measured in units of 8 kilograms—the amount the International Atomic Energy Agency considers sufficient to make a Nagasaki-type bomb—then there is enough excess weapons plutonium to build about 9,000 bombs, and enough plutonium separated from spent reactor fuel to build another 25,000.
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