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nouna solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
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Definition that contains plutonium
- weapons-grade plutonium plutonium 239 that is recovered when nuclear weapons are disassembled; it is stored in plutonium pits
- weapons plutonium plutonium 239 that is recovered when nuclear weapons are disassembled; it is stored in plutonium pits