Abstract Diamond crystal-based detector for neutron flux measurement is a promising solution as a fast, small and stable detector especially suited for fast transient measurements. The work aims to test the method and to find the best parameters of the pulse shape analysis for the thermal neutron detection. The developed diamond detectors were tested with the AmBe neutron source and in the VR-1 reactor core. Based on the results obtained from the AmBe measurements, the discrimination conditions for the pulse shape analysis were set and optimized. The diamond detector was then tested in mixed n- γ field of the nuclear reactor core. First results from the VR-1 reactor measurement showed high yield of thermal neutron interactions (up to 33% of all recorded interactions, like in AmBe measurements). The presented results therefore proved that diamond detectors are promising for the fast transient measurements.

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VR-1反应堆金刚石基探测器脉冲波形法参数研究及实验测试

摘要 基于金刚石晶体的中子通量测量探测器作为一种快速、小型和稳定的探测器尤其适用于快速瞬态测量，是一种很有前景的解决方案。工作旨在测试该方法并找到用于热中子探测的脉冲形状分析的最佳参数。开发的金刚石探测器在 AmBe 中子源和 VR-1 反应堆堆芯中进行了测试。根据从 AmBe 测量获得的结果，设置和优化脉冲形状分析的判别条件。然后在核反应堆堆芯的混合 n-γ 场中测试金刚石探测器。VR-1 反应堆测量的第一个结果显示热中子相互作用的高产率（高达所有记录相互作用的 33%，如 AmBe 测量）。