Efficiency refers to the proportion of particles detected, without any dimension (unit), but sensitivity is defined as the amount of current, voltage, or charge that a detector or detection system can obtain per unit radiation physical quantity (detection object) of a certain radiation field when operating in a linear dynamic range, and therefore has a dimension (unit) of physical quantity.
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The terms efficiency and sensitivity are often used to describe the properties of a radiation detector that detects gamma photons from a radioactive source. When used in pulsed mode, the output of the detector is a count rate (usually in counts per second or cps). Efficiency is the ratio of detected count rate to the emission rate of photons from the source (emitted photons per second). Sensitivity is the ratio of detected count rate to decay rate of the source (i.e. activity in Bq or disintegrations per second). Defined in this way, both efficiency and sensitivity are unitless ratios, although sensitivity is often expressed as cps per Bq. They are related by the number of photons emitted by the radioactive source per disintegration.
