This input allows you to choose which units you want to use for the design parameters.
The basic units are disintegrations per minute per 100 square centimeters (dpm/100cm2).
If the probe area has been specified, then disintegrations per minute (dpm) is also available.
If all the efficiencies and the probe area have been specified, then counts per minute (cpm) is available. This is the preferred unit because it is the common reading for radiation detectors.