A weapons-grade substance is one that is pure enough to be used to make a weapon or has properties that make it particularly suitable for weapons use. Plutonium and uranium in grades normally used in nuclear weapons are the most common examples. (These nuclear materials have other categorizations based on their purity.) Only fissile isotopes of ce...
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http://en.wikipedia.org/wiki/Weapons-grade
adjective of a quality adequate for use in weapons (especially in weapons of mass destruction); `weapons-grade plutonium`; `weapons-grade anthrax`
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https://www.encyclo.co.uk/local/20974
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