Chemistry
posted by Mr.Chemistry .
A 71 mg sample of a radioactive nuclide is administered to a patient to obtain an image of her thyroid. If the nuclide has a halflife of 12 hours, how much of the nuclide remains in the patient after 4.0 days?

How many half lives is that? ANS: 8
71mg (1/2)^8= (use your calculator)
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