DETECTOR VOLTAGE Radiation DetectorsDETECTOR VOLTAGEDifferent ranges of applied voltage result in unique detection characteristics.EO 1.5 Given a diagram of an ion pairs collected -vs- detectorvoltage curve, DESCRIBE the regions of the curve toinclude:a. The name of the regionb. Interactions taking place within the gas ofthe detectorc. Difference between the alpha and betacurves, where applicableAppliedVoltageThe relationship between the applied voltage and pulse height in a detector is very complex.Pulse height and the number of ion pairs collected are directly related. Figure 6 illustrates ionpairs collected -vs- applied voltage. Two curves are shown: one curve for alpha particles andone curve for beta particles; each curve is divided into several voltage regions. The alpha curveis higher than the beta curve from Region I to part of Region IV due to the larger number of ionpairs produced by the initial reaction of the incident radiation. An alpha particle will create moreion pairs than a beta since the alpha has a much greater mass. The difference in mass is negatedonce the detector voltage is increased to Region IV since the detector completely discharges witheach initiating event.IC-06 Page 14 Rev. 0
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