Improving thermal-neutron detection efficiency of silicon neutron detectors using the combined layers of (B4C)-B-10 on (LiF)-Li-6
Improving thermal-neutron detection efficiency of silicon neutron detectors using the combined layers of (B4C)-B-10 on (LiF)-Li-6
复制标题
使用 (LiF)-Li-6 上的 (B4C)-B-10 组合层提高硅中子探测器的热中子探测效率
DOI：
10.1016/j.nima.2019.04.051
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Lei Jiarong
中科院分区：
文献类型：
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作者：
Jiang Yong;Wu Jian;Yin Yanpeng;Lu Yi;Wu Kunlin;Fan Xiaoqiang;Lei Jiarong
我们测试了10 B 4 C/6 LiF（10 B 4 C/6 LiF）中子转换器的层状结构，用于硅中子探测器。与传统单层转换器相比，组合层有效地提高了热中子探测的效率。硅中子探测器由2 cm× 2 cm的硅平面探测器构成，并与由沉积在陶瓷上的10 B 4 C、6 LiF或10 B 4 C/6 LiF层制成的可拆卸中子转换器耦合。这些设备的响应进行了测试与241安培-锂中子源和伴随的背景伽马射线。通过改变241 Am-Li中子源和137 Cs或60 Co伽马源辐照时探测器的偏置电压，测试了设备区分中子事件与背景伽马射线的能力。采用10 B 4 C/6 LiF转换器（10 B 4 C/6 LiF转换器厚度为1.2 μ m，6 LiF转换器厚度为21.1 μ m）的硅中子探测器达到了5.6%的预期热中子探测效率。紧凑的尺寸，简单的结构，和低偏置电压，这些设备使他们有希望的中子探测器的应用，如中子剂量计和束流监测器。
We tested a layered structure of 10 B 4 C on 6 LiF (10 B 4 C/6 LiF) neutron converter for use with silicon neutron detectors. The combined layers effectively improve the efficiency of thermal-neutron detection over that of traditional single-layer converters. Silicon neutron detectors were constructed from a 2 cm× 2 cm silicon planar detector and coupled with removable neutron converters made from layers of 10 B 4 C, 6 LiF, or 10 B 4 C/6 LiF deposited on ceramics. The responses of these devices were tested with an 241 Am–Li neutron source and the accompanying background gamma rays. The capability of the devices to discriminate neutron events from background gamma rays was tested by varying the bias voltages of the detectors when irradiated with an 241 Am–Li neutron source and with 137 Cs or 60 Co gamma sources. The silicon neutron detector using the 10 B 4 C/6 LiF converter of 1.2-μ m-thick 10 B 4 C and 21.1-μ m-thick 6 LiF achieved the expected thermal-neutron detection efficiency of 5.6%. The compact size, simple construction, and low bias voltage of these devices make them promising for neutron detector applications like neutron dosimeters and beam monitors.