Detection Efficiency of Radiation Detectors
The ratio of the number of particles detected by the detector to the number of particles of that type incident on the detector during the same time interval. It is related to the sensitive volume, geometry and sensitivity of the detector to incident particles. Generally, detectors are required to have high detection efficiency. But in some special occasions, such as under extremely strong radiation field, the detector is required to have lower sensitivity. It refers to the ratio of the number of photon events generated to the number of incident photons in the initial process of photon and detector interaction. It describes the detector's ability to receive and record information. Incident photons have the potential to penetrate the medium or be reflected by the medium. Sometimes the medium absorbs several photons to cause a photon event, and sometimes the generated photon event is not detected, so the quantum efficiency of the general detector is less than 1.
