| 基于硅酸盐钆掺杂的紧凑热中子准直器仿真模拟及性能研究 |
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| 引用本文： | 李达,刘永德,杨丽芳,郭靓,刘立坤,周志波. 基于硅酸盐钆掺杂的紧凑热中子准直器仿真模拟及性能研究[J]. 原子能科学技术, 2020, 54(11): 2258-2263. DOI: 10.7538/yzk.2020.youxian.0337 |
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| 作者姓名： | 李达 刘永德 杨丽芳 郭靓 刘立坤 周志波 |
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| 作者单位： | 国家核安保技术中心，北京102401；中国原子能科学研究院，北京102413 |
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| 摘 要： | 在核安保管理中，基于中子发生器的热中子成像技术可对被屏蔽核材料进行无损检测成像。为提高成像质量，需对慢化后的中子进行准直。本文使用蒙特卡罗软件Geant4对一种基于硅酸盐钆掺杂的紧凑中子准直器进行了理论建模，对该准直器的热中子透过率和准直率进行了模拟计算，计算结果将用于指导后续的核材料中子成像系统构建。
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| 关 键 词： | 核安保 核材料裂变反应 中子成像 中子透过率 中子分布 |
Simulation and Performance Study on Compact Thermal Neutron Collimator Based on Gadolinium doped Silicate |
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| LI Da,LIU Yongde,YANG Lifang,GUO Liang,LIU Likun,ZHOU Zhibo. Simulation and Performance Study on Compact Thermal Neutron Collimator Based on Gadolinium doped Silicate[J]. Atomic Energy Science and Technology, 2020, 54(11): 2258-2263. DOI: 10.7538/yzk.2020.youxian.0337 |
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| Authors: | LI Da LIU Yongde YANG Lifang GUO Liang LIU Likun ZHOU Zhibo |
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| Affiliation: | State Nuclear Security Technology Center, Beijing 102401, China;China Institute of Atomic Energy, Beijing 102413, China |
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| Abstract: | In order to achieve the goal of nuclear security, the neutron generator is used to image shielded nuclear material by non-destructive analysis method. In order to improve the imaging quality, it is necessary to collimate the slowed neutrons. In this paper, the Monte Carlo software Geant4 was used to theoretically model a new compact thermal neutron collimator based on gadolinium-doped silicate, and the thermal neutron transmittance and collimation ratio of the collimator were simulated and calculated. The calculation results will be used to guide the subsequent construction of neutron-based nuclear material imaging systems. |
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| Keywords: | nuclear security fission of nuclear material neutron photograph neutron transmittance neutron distribution |
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