长计数器的特性研究及其在屏蔽性能测量中的应用

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Characteristic Investigation of the Long Counters and Application in Measuring Shield Capability

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China;National Engineering Research Center of Nuclear Technology Application in Industry, Mianyang, Sichuan, 621900, China

摘要: 用²⁵²Cf中子源对BF₃计数管进行了调试,确定其最佳工作电压为1450V,计数管有效中心在长计数器端面内13.5cm处。通过不同厚度聚乙烯慢化同一中子源的计数率的比较发现,长计数器的"平"特性较好。用长计数器测量了一种新研制的含硼聚乙烯材料的中子衰减系数为0.236,MC方法计算值为0.218,二者在误差范围内符合。
- 长计数器 /
- 中子注量 /
- 衰减系数 /
- 探测效率
Abstract: The long counter’s Supply Voltage is 1450V that confirmed by ²⁵²Cf neutron source, The effective center is 13.5cm away from the front surface of the long counter. It found that the long counter is smooth characteristic by comparing count rate with different thickness polyethylene that moderating the same neutron source. attenuation coefficient of a new developed boronizing polyethylene is measured using the BF₃ long counters, and the experimental result is 0.236, the calculated value with MC is 0.218. both accord with range of error.
- Long counter /
- Neutron flux /
- Attenuation coefficient /
- Detection efficiency