强辐射环境下高能脉冲裂变中子探测方法
Detection of high-energy pulsed fission neutrons under high intensity irradiation
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摘要: 在研究通道衰减、探测方法分离和探测器中子/射线本征分辨的基础上，研究了测量高能脉冲裂变中子数目的探测技术。基于电流型Si-PIN探测器，设计了减本底的背靠背探测结构，给出了测量强射线和低能散射中子干扰信号及有效扣除强辐射本底的实现方法，最终实现了高n/n和n/分辨测量和强裂变中子、射线混合场中的高能脉冲裂变中子数目探测，探测系统的信号/辐射本底比可达到10倍以上。Abstract: An approach for the measurement of the number of high-energy pulsed fission neutrons is investigated. The radiation absorber in the beam and the thickness of CH2 proton radiator are optimized. The background from scattering neutrons and gamma rays is measured in situ using the back-to-back structure designed and then subtracted directly. The signal-to-background ratio of the detection system for measuring high-energy fission neutrons is up to 10.
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