Development and characterization of a neutron detector based on a lithium glass–polymer composite
Development and characterization of a neutron detector based on a lithium glass–polymer composite
复制标题
基于锂玻璃聚合物复合材料的中子探测器的开发和表征
DOI：
10.1016/j.nima.2015.03.014
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发表时间：
2015
影响因子：
1.4
通讯作者：
I. Jovanovic
中科院分区：
文献类型：
--
作者：
M. Mayer;J. Nattress;V. Kukharev;A. Foster;A. Meddeb;Cory L. Trivelpiece;Z. Ounaies;I. Jovanovic
我们报告的中子闪烁探测器的锂玻璃聚合物复合材料的基础上，利用脉冲高度和脉冲形状的歧视（PSD）的组合，以实现高伽马抑制的制造和表征。与PSD介质中的快中子检测相反，我们将不具有固有中子/γ PSD特性的两种增透材料组合联合收割机以在复合材料中实现有效的PSD/脉冲高度辨别。与基于反冲的快中子探测不同，由于6Li上的高Q值中子捕获，即使在低中子能量下，中子/伽马鉴别也可以是鲁棒的。用直径为1 mm的锂玻璃棒和聚乙烯基甲苯制成直径为5.05 cm、高为5.08 cm的圆柱形检测器。探测器对252 Cf入射裂变中子的本征效率和伽马抑制分别为0.33%和小于10−8。这些结果证明了中子探测器的高选择性，并为针对特定应用优化的大型探测器原型设计提供了动力，例如裂变产生的中子的探测和逐事件光谱法。
We report on the fabrication and characterization of a neutron scintillation detector based on a Li-glass–polymer composite that utilizes a combination of pulse height and pulse shape discrimination (PSD) to achieve high gamma rejection. In contrast to fast neutron detection in a PSD medium, we combine two scintillating materials that do not possess inherent neutron/gamma PSD properties to achieve effective PSD/pulse height discrimination in a composite material. Unlike recoil-based fast neutron detection, neutron/gamma discrimination can be robust even at low neutron energies due to the highQ-value neutron capture on6Li. A cylindrical detector with a 5.05 cm diameter and 5.08 cm height was fabricated from scintillating 1 mm diameter Li-glass rods and scintillating polyvinyltoluene. The intrinsic efficiency for incident fission neutrons from252Cf and gamma rejection of the detector were measured to be 0.33% and less than 10−8, respectively. These results demonstrate the high selectivity of the detector for neutrons and provide motivation for prototyping larger detectors optimized for specific applications, such as detection and event-by-event spectrometry of neutrons produced by fission.