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Definition of "Plutonium" |
A transuranic element, formed in a nuclear reactor by neutron capture. It has several isotopes, some of which are fissile and some of which undergo spontaneous fission, releasing neutrons. Weapons-grade plutonium is produced in special reactors to give >90% Pu-239, reactor-grade plutonium contains about 30% non-fissile isotopes. About one third of the energy in a light water reactor comes from the fission of Pu-239, and this is the main isotope of value recovered from reprocessing spent fuel. / A transuranic element, formed in a nuclear reactor by neutron capture. It has several isotopes, some of which are fissile and some of which undergo spontaneous fission, releasing neutrons. Weapons grade plutonium is produced in special reactors to give 90% Pu 239, reactor grade plutonium contains about 30% non fissile isotopes. About one third of the energy in a light water reactor comes from the fission of Pu 239, and this is the main isotope of value recovered from reprocessing spent fuel. |
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