Design of high reliability nuclear logging probe

Yingchun Xiao, Shihong Xiang, Zhengyu Zhao, Zuping Qian
<span title="">2010</span> <i title="Elsevier BV"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/5i4djr4tgnbobnjegejzpw7nny" style="color: black;">Procedia Engineering</a> </i> &nbsp;
Nuclear Logging Probe may measure the naturally occurring gamma ray radiation level and detect gamma rays from a radioactive source within a well bore. It is used for depth correlation, lithology, mixture density measurement, identification of radioactive scale. But because of the harsh working environment, high temperature above 100 , high pressure, shock, it is difficult to get accurate measurement result. In this paper several possible cases that affect the measurement result were discussed;
more &raquo; ... and then provide appropriate solutions. The application of photomultiplier tube (PMT), NaI crystal, design of photon counting unit, divider of PMT were also discussed; A detailed circuit with high reliability is presented. Some measured results of the actual circuit are shown.
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