medium · MCAT chem-phys
A medical imaging technician prepares a dose of Technetium-99m, which has a half-life of 6.0 hours.
If the initial activity of the sample is 400 mCi, what will the activity be after 18 hours have elapsed?
- 50 mCi
- 133 mCi
- 25 mCi
- 100 mCi
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