The Gamma Gross Count Rate represents how many gamma rays the monitor detects each minute.

RadNet stationary air monitors measure gamma radiation emitted from airborne radioactive particles as they collect on the monitor’s filter. EPA uses RadNet monitors to track fluctuations in GAMMA radiation emitted from airborne radioactive particles at each of our sites. Tracking these changes over time gives a picture of the background (normal) levels and allows EPA scientists to detect any unusual changes.