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Radioactive iodine, I131I131 ,is used in some forms of medical diagnostics.The half-life of I131I131 is 8.0252 days. If the initial activity of a sample is

Radioactive iodine, I131I131 ,is used in some forms of medical diagnostics.The half-life of I131I131 is 8.0252 days.

If the initial activity of a sample is 64.7 mCi, what is the mass of I131I131 in the sample?the answer is 5.21 E-7 but I don't know how to get that please help

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