A vial containing radioactive selenium-75 has an activity of 2.3 mci/ml. If 2.6 mci are required for a leukemia test, how many microliters must be administered?

Question

Mayra Bishop

Chemistry

11 June, 16:24

A vial containing radioactive selenium-75 has an activity of 2.3 mci/ml. If 2.6 mci are required for a leukemia test, how many microliters must be administered?

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Braydon Coffey · Answer 1

Answer is: 1130 microliters must be administered.

activity (selenium-75) = 2.3 mCi/mL.

radioactivity (Se-75) = 2.6 mCi; mCi is millicurie.

The curie (symbol: Ci) is a non-SI unit of radioactivity.

V (Se-75) = radioactivity (Se-75) : activity (Se-75).

V (Se-75) = 2.6 mCi : 2.3 mCi/mL.

V (Se-75) = 1.13 mL; volume.

V (Se-75) = 1.13 mL · 1000µL/mL.

V (Se-75) = 1130 µL.