The number of events detected in one minute by a radiation detector.
Because radiation detection may not be 100% efficient (that is, not every radioactive transformation may be detected by a radiation detector every time), the efficiency of the detector must be determined in order to relate counts per minute to disintegrations per minute.
Since you measure countsperminute (cpm), the specific radioactivity is more useful when stated in terms of cpm.
C is cpmcounted, V is volume of the solution you counted in ml, and Y is the specific activity of the radioligand in cpm/fmol (calculated in the previous section).
This is the confidence interval for the number of counts in 10 minutes, so the 95% confidence interval for the average number of countsperminute extends from 216 to 234.
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