= Weapons-grade nuclear material
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For <nuclear weapons> you need a certain level of <isotope> purity of either <plutonium-239> or <uranium-235>.
And the easiest way by far to achieve this purity is to produce <plutonium-239> in a <breeder reactor>, which allows you to get it out with much cheaper chemical processes rather than costly <isotope separation> methods.
https://fissilematerials.org/ summarizes stockpiles and production status. https://web.archive.org/web/20240815234449/https://fissilematerials.org/[20224 Archive].
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