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plutonium 239
 
Noun plutonium 239 has 1 sense
  1. 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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