A 64-mCi sample of Tl-201 decays to 4.0 mCi in 12 days. What is the half-life, in days

Chapter 0, Problem 5.81

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A 64-mCi sample of Tl-201 decays to 4.0 mCi in 12 days. What is the half-life, in days, of Tl-201? 15.3, 5.42

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