Radiation DetectorsDETECTOR VOLTAGEFigure 6 Ion Pairs Collected -vs- Applied VoltageRecombinationRegionIn the recombination region (Region I), as voltage increases to V1, the pulse heightincreases until it reaches a saturation value. At V1, the field strength between the cathodeand anode is sufficient for collection of all ions produced within the detector. At voltagesless than V1, ions move slowly toward the electrodes, and the ions tend to recombine toform neutral atoms or molecules. In this case, the pulse height is less than it would havebeen if all the ions originally formed reached the electrodes. Gas ionization instrumentsare, therefore, not operated in this region of response.Rev. 0 Page 15 IC-06
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