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Iodine-131 has a half-life of about 8.0 days. When consumed in food, it localizes in the thyroid. Suppose 7.0 percent of the 131I localizes in the thyroid and that 20 percent of its disintegrations are detected by counting the emitted gamma rays. How much 131I must be ingested to yield a thyroid count rate of 50 counts per second? |
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