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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.
If the Earth were to suddenly stop revolving around the Sun the gravitational force that the Sun exerts on the Earth would cause the Earth to "fall" directly into the Sun
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