Thermal neutron detector based on BNCT beam monitoring: conceptual design and readout electronics measurement

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-06-23 DOI:10.1016/j.radphyschem.2025.113107

Juan Li, Xinle Lang, Yucong Chen, Xiaotao Liu, Zulong Zhao, Xincai Kang, Zhiguo Xu, Ruishi Mao, Zhengguo Hu, Guoqing Xiao

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引用次数: 0

Abstract

Beam monitoring and evaluation are very important to boron neutron capture therapy (BNCT), and a variety of detectors have been developed for these applications. In this study, a method of position sensitive neutron detector based on evaporated solid neutron conversion layer is proposed and designed, and the structure design and working gas optimization of the detector are carried out by Monte Carlo method. The related hardware design of readout electronics for neutron detector is completed, and the electronic performance test is carried out. The results show that the thickness of the neutron conversion layer is the best when the thickness of the neutron conversion layer is 2 μm. At the same time, the aluminum layer coated with 2 μm after the neutron conversion layer can effectively reduce the most probable angle of the emitted particles, and Ar: CO2 (90: 10) is used as the working gas. The front-end readout electronics can meet the bipolar signal processing of 64 channels in the dynamic range of 120 fC ∼10 pC at the sampling frequency of 1–100 MHz. The set of electronic system has high integration, low noise, low power, and can quickly process multi-channel signals. The integral nonlinearity is less than 1.5 %, which can meet the requirements of real-time online monitoring neutron detectors of BNCT. It is evident that this ionization-based neutron detector with multichannel and high counting rate capability has great development prospects dose monitoring and evaluation applications in BNCT.

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基于BNCT束监测的热中子探测器：概念设计和读出电子测量

束流监测和评价对硼中子俘获治疗（BNCT）非常重要，各种各样的探测器已经被开发出来。本文提出并设计了一种基于蒸发固体中子转换层的位置敏感中子探测器的方法，并利用蒙特卡罗方法对探测器进行了结构设计和工作气体优化。完成了中子探测器读出电子器件的相关硬件设计，并进行了电子性能测试。结果表明：当中子转换层厚度为2 μm时，中子转换层的厚度最好；同时，在中子转换层后包覆2 μm的铝层可以有效降低发射粒子的最可能角度，工作气体采用Ar: CO2（90: 10）。前端读出电子器件可以满足在120 fC ~ 10 pC动态范围内64通道双极信号处理，采样频率为1-100 MHz。该电子系统集成度高，噪声低，功耗低，能快速处理多路信号。积分非线性小于1.5%，能够满足BNCT中子探测器实时在线监测的要求。可见，这种基于电离的多通道、高计数率的中子探测器在BNCT的剂量监测与评价应用中具有很大的发展前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.