If you Google Auto-Immune disease, you’ll find that it is ...

a) The isotope iodine-131 can be used to treat malignant growths in the thyroid gland. The isotope has a radioactive half-life of 8 days and a biological half-life of 21 days. Calculate its effective half-life and determine the time it would take for its activity to decrease to 10% of its initial activity. ................
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