Source: cirosantilli/gun-type-fission-weapons-don-t-work-with-plutonium
= Gun-type fission weapons don't work with plutonium
<Gun-type fission weapons> don't work with <Plutonium-239> because of the presence of <Plutonium-240> as an impurity which leads to <fizzle (nuclear explosion)>.
Good mentions at: https://youtu.be/dgBDvnqMkT4?t=252