An improved method for the stabilization of NaI-photomultiplier gamma detectors against thermal and other drift |
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| Affiliation: | 1. Faculty of Medicine, University of Kufa, Najaf, Iraq;2. Radiography Directorate, University of Salford, Salford, UK;3. Division of Radiography, Karolinska Institute, Stockholm, Sweden;1. Department of Display Science and Engineering, Pukyong National University, Busan 608−737, Korea;2. Interdisciplinary Program of LED and Solid State Lighting Engineering, Pukyong National University, Busan 608-737, Korea;3. Department of Materials Science and Engineering, Pukyong National University, Busan 608-739, Korea;1. Department of Computer Science, City University of Hong Kong, Hong Kong;2. Department of Electronics & Information Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;3. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518067, China;4. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China |
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| Abstract: | Alpha peaks have been used as part of servo systems to stabilize NaI-photomultiplier gamma detectors against drift. However, alpha peaks shift with temperature change differently than do gamma peaks, thus spoiling what would otherwise be a workable scheme for stabilizing against probably the most serious source of NaI-p.m. detector drift, namely thermal effects. It has been found possible to accurately compensate for the difference in the shift with temperature versus gamma peaks using the signal derived from a thermistor in thermal contact with the NaI crystal to control the bias of a discriminator in the servo circuit. The servo circuit utilizing this principle has been used in commercial multichannel analyzers of the type intended for field use under adverse ambient conditions. |
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