counting rate

In radiation detection, a counting rate refers to the number of pulses, or signals, an active detector registers over a specific period. These pulses indicate the presence of ionizing radiation.1

Active detectors can signal individual radiation events or the collective effect of many. Counting systems aim to record the total number of pulses or the rate at which they occur. This can involve filtering pulses based on their amplitude to focus on specific types of radiation.1

A crucial factor in counting systems is dead time, a brief period after each detected event during which the system is insensitive to new events. This can lead to a measured count rate slightly lower than the actual rate, especially at high radiation levels. Corrections can be applied if the dead time is known.1

Alternatively, a rate meter can electronically display the average rate of accepted pulses in real time. The unit of activity, the becquerel (Bq), is defined as one disintegration per second.12