10 microL of 10 microMolar Tracer is 10 pico mole which give the count of
[(cpm of Standard)-(cpm of blank)]
Thus,
the amount of Tracer in the apical sample (in pico mole) is
[(10 pico mole)][(cpm of apical sample)-(cpm of blank)] /[(cpm of Standard)-(cpm of blank)]
