Optimization of Control Parameters of PMT-Based Photon Counting System
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Photomultiplier tube (PMT) is widely used in photon counting systems because of its gain and low light sensing capability in discrete photon region. PMT-based photon counters are used in various fields such as medical, particle counting and sizing, and pollution-level monitoring. The output of photon counter is highly influenced by discriminator threshold, PMT gain and PMT operating temperature. Inappropriate selection of these parameters results in inefficient and highly unstable counts. In this article, the effects on photon counting output due to variation in the above-mentioned parameters have been experimentally studied and discussed. For this purpose, a LabVIEW-based photon counting program was developed for continuous data acquisition using SR400 gated photon counter and further statistical analysis. General methodology of the selection of the above parameters for its optimum performance is explained in detail.
KeywordsPhoton counting Photomultiplier tube PMT temperature Discriminator threshold
The authors would like to thank the Director, CSIR-National Physical Laboratory, for providing the necessary facilities to carry out the above work. One of the authors, Mr. Rashtrapriya Kumar Kapri, is also thankful to the Council of Scientific and Industrial Research (CSIR), New Delhi, India, for providing the fellowship under CSIR-JRF scheme.
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