Page 798 - Radiation Safety
P. 798
Gas-filled Detectors
Proportional Counters
▪ A type of gas-filled detector
▪ Proportional tubes are almost always operated in pulse mode.
▪ Rely on the phenomenon of gas multiplication to amplify greatly the charge (electron)
represented by the original ion pairs created within the gas because of a strong applied electric
field. The amplified charge produce large voltage pulse and proportional to represent as a
radiation dose reading.
▪ One important application is the detection and spectroscopy of low energy X-radiation.
▪ Widely applied in the detection of neutrons and quantify alpha & beta activity.
