Iodine-123 is a radioactive isotope used in medicine to test the function of the thyroid gland. If

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Iodine-123 is a radioactive isotope used in medicine to test the function of the thyroid gland. If a 350 - microcurie (µCi) dose of iodine-123 is administered to a patient, the quantity Q left in the body after t hours is approximately Q = 350(1/2)t/13.1.

a. How long does it take for the level of iodine-123 to drop to 10 µCi?

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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Calculus Early Transcendentals

ISBN: 978-0321947345

2nd edition

Authors: William L. Briggs, Lyle Cochran, Bernard Gillett

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