Question

Radioactive iodine-131 decays (beta emitter) to form Xenon-131. Iodine-131 has a half-life of 8.07 days. If a thyroid gland absorbed 20.0 microcuries of I-131 today, how many microcuries would remain after 30.0 days. Microcuries are disintegrations per second of isotope decay.
20 * .5^(30/8.07)
Another way.
ln(No/N) = kt
No = 20 ug
N = ?
k = 0.693/half life in days
t = 30 days

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