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 I-131 localizes in the thyroid and that 20 percent of its disintegrations are detected by counting the emitted gamma rays. How much I-131 must be ingested to yield a thyroid count rate of 50 counts per second?
`7.8*10^{-16}" kg"` which is the mass of I-131 that must be ingested.
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