Diagnostic scanning Iodine-123 is a radioactive isotope

Chapter 3, Problem 33

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Diagnostic scanning Iodine-123 is a radioactive isotope used in medicine to test the function of the thyroid gland. If a 350-microcurie 1mCi2 dose of iodine-123 is administered to a patient, the quantity Q left in the body after t hours is approximately Q = 350112 2t>13.1. a. How long does it take for the level of iodine-123 to drop to 10 mCi? b. Find the rate of change of the quantity of iodine-123 at 12 hr, 1 day, and 2 days. What do your answers say about the rate at which iodine decreases as time increases?

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