Avial 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?

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.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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