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Geiger-Mller Region
Gas Amplification Region Summary

Instrumentation and Control 2 of 2
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Radiation Detectors DETECTOR VOLTAGE Continuous Discharge Region In the continuous discharge region (Region VI), a steady discharge current flows.   The applied  voltage  is  so  high  that,  once  ionization  takes  place  in  the  gas,  there  is  a continuous  discharge  of  electricity,  so  that  the  detector  cannot  be  used  for  radiation detection. Radiation detectors are normally designed to respond to a certain type of radiation.   Since the detector  response  can  be  sensitive  to  both  energy  and  intensity  of  the  radiation,  each  type  of detector has defined operating limits based on the characteristics of the radiation to be measured. A large variety of detectors are in use in DOE facilities to detect alpha and beta particles, gamma rays, or neutrons.   Some types of detectors are capable of distinguishing between the types of radiation;  others  are  not.    Some  detectors  only  count  the  number  of  particles  that  enter  the detector, while others are used to determine both the number and energy of the incident particles. Most detectors used in DOE facilities have one thing in common: they respond only to electrons produced in the detector.  In order to detect the different types of incident particles, the particle’s energy must be converted to electrons in the detector. Gas-filled detectors are used, for the most part, to measure alpha and beta particles, neutrons, and gamma  rays.   The  detectors  operate  in  the  ionization,  proportional,  and  G-M  regions  with  an arrangement most sensitive to the type of radiation being measured.   Neutron detectors utilize ionization chambers or proportional counters of appropriate design.  Compensated ion chambers, BF3 counters, fission counters, and proton recoil counters are examples of neutron detectors. Rev. 0 Page 17 IC-06







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