About how many years will it take for a sample of plutonium-239 to have only $ \frac{1}{16} $ as much plutonium-239 as the original sample?

Name: About how many years will it take for a sample of plutonium-239 to have only $ \frac{1}{16} $ as much plutonium-239 as the original sample?
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Question

About how many years will it take for a sample of plutonium-239 to have only   $ \frac{1}{16} $  as much plutonium-239 as the original sample?

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The Answer of About how many years will it take for a sample of plutonium-239 to have only   $ \frac{1}{16} $  as much plutonium-239 as the original sample?

About How Many Years Will It Take for a Sample 116 \frac{1}{16} 161​

About How Many Years Will It Take for a Sample $\frac{1}{16}$