If 135. mg of fluorine-18 is shipped at 10:00 A.M., how many milligrams of the radioisotope are still active after 110 min ?

1 answer:

8 0

Fluorine-18 is a radioactive isotope of the element fluorine. According to Wikipedia, its half-life is 109.771 minutes, which means the amount present is halved every 109.771 minutes.

You can use the formula for half-life, such that $A(t)=A_0( \frac{1}{2})^{ \frac{T}{t_{ \frac{1}{2} }}$ . You begin with 135 mg fluorine-18. We don't even need to plug in to the formula to see that after 110 min, the amount has halved to equal 67.5 mg.

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