If 200. mg of fluorine-18 is shipped at 7:00 A.M., how many milligrams of the radioisotope are still active when the sample arrives at the radiology laboratory at 4:10 P.M.?

Answer 1

half life = 109.8minutes
minutes from 7am to 4:10= 9*60+10

Amountleft= 200mg*e^(-.693*minutes/109.8)