The half-life of ³H is 12 years. About how long does it take for 63/64 of a sample of that radionuclide to decay?

Name: The half-life of 3 H is 12 years. About how long does it take for 63/64 of a sample of that radionuclide to decay?
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Question

Quizplus · Accepted Answer

The decay of 63/64 of a sample means that 1/64 of the sample remains. This corresponds to 6 half-lives (since (1/2)^6 = 1/64). Since the half-life is 12 years, it takes 6 * 12 = 72 years for 63/64 of the sample to decay.

The Half-Life of 3H Is 12 Years

The Half-Life of ³H Is 12 Years