Iodine-131 is used in the treatment of tumors in the thyroid gland. Its half-life is 8.1 days. Suppose that, due to a shipment delay, the I-131 in a hospital’s pharmacy is 2.0 days old.
(a) What percentage of the I-131 has disintegrated?
(b) A patient is scheduled to receive 15.0 mg of I-131. What dosage (in milligrams) should the hospital pharmacist recommend for this patient if the 2-day-old bottle of I-131 is used?
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