Fluorine-18 used in PET scans has a half-life of 110 min. If a 100.0 mg sample of the radioisotope is shipped at 8:00am, and the scan requires a minimum of 12.5 mg, what is the latest arrival time possible? a) 1:30pm O b) 1:00pm c) 2:00pm d) 12:30pm e) 12:00pm

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