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目的建立基于固体核径迹技术的中子个人剂量监测系统。方法从CR39中子探测原理和剂量计结构出发,对CR39中子个人剂量计的能量响应、角度响应以及对镅铍中子源产生的中子注量响应等进行性能实验,并建立相应的质量控制体系。结果 CR39中子探测元件的探测阈能约是100 keV,中子注量灵敏度与中子能量和入射角有较强的中子依赖性,入射中子的临界角约为64°,该批次CR39对241Am-Be源的中子注量灵敏度约为2.24×10-4tracks.n-1.cm-2。结论固体核径迹技术(CR39探测元件)进行中子外照射个人剂量监测,可以在中子辐射场有效区分n-γ混合场的中子剂量贡献,还具有低信号衰退率,环境依赖性小,可探测能量高等特点,适合进行油气田行业的中子职业个人监测工作。
Objective To establish a neutron personal dose monitoring system based on solid nuclear track technology. Methods Based on the neutron detection principle of CR39 and dosimeter structure, the energy response, angular response of CR39 neutron personal dosimeter and the neutron flux response of 镅 beryllium neutron source were tested and the corresponding quality Control system. Results The detection threshold of CR39 neutron detector was about 100 keV. The sensitivity of neutron fluence was strongly dependent on neutron energy and incident angle. The critical angle of incident neutron was about 64 °. The neutron fluence sensitivity of CR39 to 241Am-Be source is about 2.24 × 10-4tracks.n-1.cm-2. Conclusion Solid-neutron track technique (CR39 detection element) is used to monitor neutron dose in neutrons. It can effectively distinguish neutron dose contribution of n-γ mixing field in neutron radiation field, and also has low signal decline rate and small environmental dependence , Can detect high energy characteristics suitable for oil and gas field industry neutron job personal monitoring.