Iodine-125 emits gamma rays when it decays time Tellurium-125 and has a half-line of 60 days. If a 0.020 g pellet of iodine-125 is implanted into a prostate gland, how much iodine -125 remains there after one year?

Chemistry
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Chapter1: Chemical Foundations
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Iodine-125 emits gamma rays when it decays time Tellurium-125 and has a half-line of 60 days. If a 0.020 g pellet of iodine-125 is implanted into a prostate gland, how much iodine -125 remains there after one year? 

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