高本底环境γ强度测量的符合计数法应用分析
Analysis of Coincidence Technique to Distinguish Gamma Signal in High Background
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摘要: 用脉冲源法确定反应堆次临界度的实际测量工作中，由于某些特定测试环境的布局空间有限，强中子外源与待测系统周围的其他物质导致的环境本底干扰非常严重。本文提出通过符合1个伽玛射线穿过两个探测器的时间的计数方法来提高探测系统对信号的辨识能力，通过这种方法提高高本底环境下的测量信号的信噪比，并对该方法的测试原理、方法可能性及系统探测效率等问题进行初步分析。Abstract: The pulsed source method is one of the methods to confirm the time multiplication constant (α-eigenvalue) for a subcritical reactor. But its applicability is determined by the characteristic of the neutron source and the practical surroundings. In this article, a new method to reduce the response of the gamma background was designed, and the needed condition of the detector was also qualified.
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