After the sudden release of radioactivity from the Chernobyl nuclear reactor acc

Question

After the sudden release of radioactivity from the Chernobyl nuclear reactor accident in 1986, the radioactivity of milk in Poland rose to 2000 Bq/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 in Bq/L. Assume one liter of milk contains 2.00 g of potassium, of which 0.0117% is the isotope 40K, which has a half life of 1.28E9 yr. B) After what length of time would the activity due to iodine fall below that due to potassium?

Explanation / Answer

http://minerva.union.edu/labrakes/Radioactivity_Solutions.pdf problem 10 on the link above

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