medium · MCAT Chemical & Physical Foundations of Biological Systems
An isotope used in medical imaging has a half-life of 6 hours.
If a patient is injected with 40 mg of this isotope, how much will remain in their body after 18 hours, assuming no biological excretion?
- 13.3 mg
- 10 mg
- 5 mg
- 2.5 mg
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