Fluorine-18, which has a half-life of 110 min, is used in pet scans. a. if 100. mg of fluorine-18 is shipped at 8: 00 a. m., how many milligrams of the radioisotope are still active after 110 min? b. if 100. mg of fluorine-18 is shipped at 8: 00 a. m., how many milligrams of the radioisotope are still active when the sample arrives at the radiology laboratory at 1: 30 p. m.?

Explanation:

For every hal-life time the amount of the radioisotope (fluorine-18) will be cut to half.

Part a.

Since the half-life of fluorine-18 is 110 min, ater this very time, half of the fluorine-18 is still alive, i.e 100. mg / 2 = 50.0 mg. ← answer

Part b.

Compute the time elapsed from 8:00 am, when the fluorine-18 is shipped, to 1:30 pm, when the sample arrives at teh radiology laboratory.

Compute the number of half-lives in 330 min:

Conclusion:

it is a good conductor

explanation:

the answer would be c