medium · MCAT chem-phys
A sample of radioactive tracer is used in a PET scan. If the isotope has a half-life of 2 hours and the initial activity is 160 mCi, what will be the activity after 6 hours?
- 40 mCi.
- 20 mCi.
- 80 mCi.
- 10 mCi.
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