Iodine-131 has a half-life of 8.02 days, making it useful for treatment and medical diagnostics. Starting with a sample of 200. mg of Iodine-131, how much of the isotope would remain after 24 days?

Question

Quizplus · Accepted Answer

After 24 days, which is three half-lives (24/8.02 ≈ 3), the sample will have gone through three half-lives. Each half-life reduces the amount by half: 200 mg → 100 mg → 50 mg → 25 mg.

Iodine-131 Has a Half-Life of 8