The half life of 131I is 8.021 days. What fraction of a sample of 131I remains after 24.063 days?
1 Answer
May 22, 2017
After three half-lines (
Explanation:
Start with your sample of iodine-131. In one half-life, just over eight days, half of the sample decays leaving the other half. That remaining half is in effect its own sample in which half decays again after another half-life. You're now left with one-fourth of the original iodine-131 with half decaying in the third half-life from when you started.
