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After the sudden release of radioactivity from the Chernobyl nuclear reactor accident in 1986, the radioactivity of milk in Poland rose to $2.00 \times 10^{3} \mathrm{Bq} / \mathrm{L}$ due to iodine-131, with a half - life of 8.04 days. Radioactive iodine is particularly hazardous because the thyroid gland concentrates iodine. The Chernobyl accident caused a measurable increase in thyroid cancers among children in Belarus. (a) For comparison, find the activity of milk due to potassium. Assume 1 liter of milk

contains 2.00 g of potassium, of which 0.011 7% is the isotope $^{40} \mathrm{K},$ which has a half-life of $1.28 \times 10^{9} \mathrm{yr}$ (b) After what length of time would the activity due to iodine fall below that due to potassium?

a. 60.6 \mathrm{Bq} / \text { Litter }

b. 40.6 d

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