Fluorine-18 undergoes positron emission with a half life of 1.10x 10 2 minutes. If a patient is given a 248 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83 mg? (assume that none of the fluorine is excreted from the body)
A. 211 minutes
B. 99 minutes
C. 300 minutes
D. 132 minutes
E. 174 minutes
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