How long would it take for plutonium to decay to one eighth of its original activity?

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How long would it take for plutonium to decay to one eighth of its original activity? resources

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Processing of Used Nuclear Fuel - World Nuclear Association

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plutonium (Pu) (chemical element) -- Encyclopedia Britannica

MLA style: "plutonium (Pu)". Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica Inc., 2014. Web. 23 Jul. 2014

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