Radioactive iodine, 131I, is used in some forms of medical diagnostics, (a) If the initial activity of

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Radioactive iodine, 131I, is used in some forms of medical diagnostics, 

(a) If the initial activity of a sample is 64.5 mCi, what is the mass of 131I in the sample? 

(b) What will the activity be 4.5 d later?

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