Asked Feb 9, 2020

Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k = 1.6*10-3 yr-1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of k = 0.011 day-1.

How much of a 1.00 mg sample of americium-241 remains after 3 half-lives?


Expert Answer

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Half-life of americium-241 is 432.2 years


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