plutonium 239

Noun plutonium 239 has 1 sense

• plutonium 239(n = noun.substance) Array - 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; Array
is a kind of atomic number 94, plutonium, pu
has particulars: weapon-grade plutonium, weapons plutonium