Problem many medical pet scans use the isotope 18f which, Ask an Expert

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Problem: Many medical PET scans use the isotope 18F, which has a half-life of 1.8hr. A sample prepared at 10:00 a.m. has an activity of 20mCi.

Part I: What is the activity at 1:00 p.m., when the patient is injected?

I would really appreciate some help for above problem and express your answer using two significant figures.

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