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noun
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.
is a specific kind of: atomic number 94, plutonium, Pu.
is a broader term that covers: weapons-grade plutonium, weapons plutonium.
Find more on plutonium 239 elsewhere: etymology - rhymes - Wikipedia.
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