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。
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.
作者
李达
刘永德
杨丽芳
郭靓
刘立坤
周志波
LI Da;LIU Yongde;YANG Lifang;GUO Liang;LIU Likun;ZHOU Zhibo(State Nuclear Security Technology Center,Beijing 102401,China;China Institute of Atomic Energy,Beijing 102413,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2020年第11期2258-2263,共6页
Atomic Energy Science and Technology
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
nuclear security
fission of nuclear material
neutron photograph
neutron transmittance
neutron distribution
