The purpose of this work is to analyze the use of detecting materials in radiation monitors as well as the replacement of widely used 3H-based neutron counters by neutron-detection scintillation technology. The replacement of helium counters is a consequence of two factors: the lack of 3He and widespread use of 3He-based counters in safety equipment, such as volumetric neutron detectors. Selection criteria for evaluating promising technologies are used in this work, specifically, high absolute neutron detection efficiency – efficiency at least 1.5 counts in 1 sec in detecting 1 ng 252Cf at distance of 2 m in a 20 mm thick moderator and low sensitivity to γ-ray detection – γ-ray detection efficiency not exceeding 10–6 with irradiation by a 0.1 μSv/h γ-ray source. Since they can have a large sensitive area and high resolution, scintillation detectors are now being proposed as alternatives to helium counters. But it is necessary to find an optimal scintillator possessing simultaneously low sensitivity to γ-radiation and to choose an optimal method of measuring information. Promising neutron detection technologies based on the glasses Li2OSiO2:Ce3+, LiF/ZnS(Ag+), Li6Gd(BO3)3:Ce, Cs2LiYCl6(Ce) (CLYC) as well as EJ-254 boron-doped plastic are examined from the standpoint of the posed problems.

中文翻译：

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在辐射监测器中使用中子闪烁探测器代替氦 3 计数器

这项工作的目的是分析检测材料在辐射监测器中的使用以及中子检测闪烁技术对广泛使用的基于 3H 的中子计数器的替代。氦计数器的更换是两个因素的结果：缺乏 3He 和基于 3He 的计数器在安全设备（如体积中子探测器）中的广泛使用。在这项工作中使用了评估有前途技术的选择标准，特别是高绝对中子检测效率——在 20 毫米厚的慢化剂中在 2 m 距离处检测 1 ng 252Cf 的效率在 1 秒内至少达到 1.5 个计数，并且对 γ- 的敏感性低射线探测——用 0.1 μSv/h γ 射线源照射时，γ 射线探测效率不超过 10-6。由于它们可以有很大的敏感区域和高分辨率，闪烁探测器现在被提议作为氦计数器的替代品。但需要找到一种对γ辐射同时具有低灵敏度的最佳闪烁体，并选择一种最佳的信息测量方法。基于玻璃 Li2OSiO2:Ce3+、LiF/ZnS(Ag+)、Li6Gd(BO3)3:Ce、Cs2LiYCl6(Ce) (CLYC) 以及 EJ-254 掺硼塑料的有前途的中子检测技术提出的问题。