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Weapons-Grade Plutonium

Plutonium containing less than 7 percent, by weight, of the isotope plutonium-240 and not qualifying for tracking as plutonium-238 or plutonium-242. A similar, but separate definition is used in certain international nonproliferation activities, where the boundary is raised to less than a ratio of 0.10 between isotopes plutonium-240 and plutonium-239.

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