plutonium 239

Noun
  1. is a type of: atomic number 94, plutonium, pu - a 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
    subtypes: weapons plutonium, weapons-grade plutonium - plutonium 239 that is recovered when nuclear weapons are disassembled; it is stored in plutonium pits

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