HyperDic: plutonium_239

English > 1 sense of the expression plutonium 239:
NOUNsubstanceplutonium 239a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel
English > plutonium 239: 1 sense > noun 1, substance
MeaningA highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons.
Narrowerweapons plutonium, weapons-grade plutoniumplutonium 239 that is recovered when nuclear weapons are disassembled
Broaderplutonium, Pu, atomic number 94A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons
Spanishplutonio 239

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