plutonium 239

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Noun plutonium 239 has 1 sense

plutonium 239 - a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons
--₁ is a kind of plutonium, Pu, atomic number 94
--₁ has particulars: weapons plutonium, weapon-grade plutonium

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