A New Concept of Thermal Neutron Counting With Sub-Microsecond Timing Resolution
A New Concept of Thermal Neutron Counting With Sub-Microsecond Timing Resolution
复制标题
亚微秒计时分辨率的热中子计数新概念
DOI：
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发表时间：
2008
影响因子：
1.8
通讯作者：
O. Siegmund
中科院分区：
文献类型：
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作者：
A. Tremsin;W. B. Feller;O. Siegmund
提出了一种新型热中子计数探测器和冷中子计数探测器的概念设计，其一维空间分辨率为 m，计时分辨率低至纳秒。该探测器使用掺杂有中子吸收 B 原子的微通道板 (MCP)。基于 MCP 的探测器可以对中子事件进行二维位置定位，其分辨率优于 30 m 和 s 的计时精度。 MCP 探测器的固有时间分辨率在亚纳秒范围内。在本文中，我们展示了如何将每个检测到的中子的高二维空间 (m) 和时间 (s) 分辨率的组合转换为一维空间 (m) 和 ns 定时分辨率。所提出的中子探测器的另一个独特特征是其相当高的中子探测效率，正如我们广泛的分析模型预测的那样，超过 50%，其准确性已由第一次实验测量证实。这些探测器的有效面积在 2 维配置中可达 1010 cm2，在一维情况下可达 1001 mm。一维探测器可以交错排列，以高定时分辨率进行二维成像。
A conceptual design of a novel type of thermal and cold neutron counting detector with one-dimensional spatial resolution of m, and timing resolution as low as nanoseconds, is proposed. The detector uses microchannel plates (MCPs) doped with neutron absorbing B atoms. MCP-based detectors allow two-dimensional position localization of neutron events with resolution better than 30 m and s timing accuracy. The intrinsic temporal resolution of MCP detectors is in the subnanosecond range. In this paper we show how this combination of high 2-D spatial (m) and temporal (s) resolution can be converted into 1-D spatial (m) and ns timing resolution for each detected neutron. Another unique characteristic of the proposed neutron detector is its rather high neutron detection efficiency, exceeding 50%, as predicted by our extensive analytical modeling, accuracy of which was confirmed by the first experimental measurements. The active area of these detectors can be as large as 1010 cm in the 2-D configuration and 1001 mm in the 1-D case. One-dimensional detectors can be staggered to perform imaging in two dimensions with high timing resolution.