Plutonium and highly enriched uranium (HEU) were first introduced fifty years ago. In the Manhattan project the amounts separated were measured in kilograms, enough for the first atomic bombs. Today there are about 1000 tons of plutonium and 1300 tons of HEU in existence, the result of the great expansion of nuclear weapon and nuclear power programmes in recent decades. Controlling and disposing of these vast quantities is now one of the most serious...
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