Question
The half-life of $^{l-131} \mathrm{I}$ is 8.04 days. On a certain day, the activity of an iodine- 131 sample is $6.40 \mathrm{mCi}$. What is its activity 40.2 days later?
Step 1
The rate of this decay is given by the half-life, which is the time it takes for half of the sample to decay. In this case, the half-life of iodine-131 is given as 8.04 days. Show more…
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