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OpenStudy (anonymous):
Assuming a half-life of 1599 years, how many years will be needed for the decay of 15/16 of a given amount of radium-226
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OpenStudy (jfraser):
If each half-life is 1600 years (roughly) then in order a substance to decay so that only 1/16 remains, then 1/2 of 1/2 of 1/2 of 1/2 is 1/16, so 4 half-lives have passed
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