In a diagnostic test of leukemia a patient receives 40 mL of

In a diagnostic test of leukemia, a patient receives 4.0 mL of a solution containing selenium-75. If the activity of the selenium-75 is 45 microCi/mL, what is the dose received by the patient? 0.089 microCi 11 microCi 180 microCi 13 500 microCi

Solution

Answer: 180 microCi (C)

Stock Activity of selenium-75 = 45 microCi/mL

This means 45 microCi in 1mL

If the patient receives 4mL, the total activity = 4 x 45 microCi = 180 microCi