4 Iodine-131 is used to treat Graves disease, a disease of the thyroid gland. The amount of 131I used depends on the size of the gland. If the dose is 86 microcuries per gram of thyroid gland, how many grams of 131I should be administered to a patient with a thyroid gland weighing 33 g? Assume all the iodine administered accumulates in the thyroid gland.  × 10 g 131I

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