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3He正比计数器的基本用途为:测定热中子束轴线的空间位置及热中子束的空间分布,从而准确地放置样品;实时监测中子注量率;另外也可用于测量镉比。在国防技术基础项目《高纯锗γ射线探测器(HPGe)在1～11MeV能区效率的校准方法研究》中,要求测量热中子束的空间分布,正常运行的反应堆的功率变化在2%之内,但常遇到功率调节和停堆,实时监测中子注量率是必要的。首先对3He正比计数器进行测试,了解其性能并选取适当的工作电压。采用Pu-C源作为
The basic use of the 3He proportional counter is to determine the spatial position of the thermal neutron beam axis and the spatial distribution of the thermal neutron beam so that the sample can be accurately placed; the neutron fluence rate can be monitored in real time; and the cadmium ratio can also be measured. In the national defense technology project “high purity germanium γ-ray detector (HPGe) in the 1 ~ 11MeV energy efficiency calibration method” requires the measurement of thermal neutron beam spatial distribution, normal operation of the reactor power changes in 2% , But often encounter power regulation and shutdown, real-time monitoring neutron fluence rate is necessary. First 3He proportional counter test to understand its performance and select the appropriate operating voltage. Pu-C source is used