Posted by **Maryanne** on Wednesday, September 5, 2012 at 9:17pm.

Suppose you had a detection device that could count every decay event from a radioactive sample of plutonium-239.052156 (t1/2 is 24,000 yr). How many counts per second would you obtain from a sample containing 0.126 g of plutonium-239? (The mass of Pu-239 is 239.052156 u. Assume 1 yr = 365 d

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