Question

Radioactive isotope 131I with a physical half-life of 8.1 days, is ingested by patients with

healthy or with hyperactive (diseased) thyroids. On two consecutive days, a counter

positioned over the gland reads 10000 and 9136 counts per second (cps) for the healthy

person and 9500 and 7340 cps for the sick person. What are the biological half-lives of the

isotope in the thyroids of the patients?

Answer 1

ve a. Radioactive 1 sta pe 131 * Posoned or thc to0o and 3 Couunt, Pe second heal person 8500 and 9-3 o Cour Hpu sick pe eson . Heal-t Peuson eAt) 913に10000e Sick

340 asco e ASO Thee fove 2692 do ends n th .th.μα..