Design of a shielding collimator device for a small-angle monoenergetic neutron source  

作　　者：Wen-Hui Lü Hui-Ping Guo Ning Lü Kuo Zhao Xiao-Tian Wang Yi-Jie Hou 

机构地区：[1]Xi'an Research Institute of Hi-Tech,Xi'an 710025,China [2]Key Laboratory of Particle and Radiation Imaging(Ministryof Education)and Department of Engineering Physics,Tsinghua University,Beijing 100083,China

出　　处：《Nuclear Science and Techniques》2018年第8期201-209,共9页核技术（英文）

摘　　要：To obtain a small-angle monoenergetic neutron source,a shielding collimator device is designed for the neutron source generated by a neutron tube.The device is divided into the collimator and the capture cave.The collimator is made of three layers of stainless steel and borated polyethylene and is used to constrain neutrons in a small angle.The capture cave is used to increase the number of times neutron inelastic scattering occurs in the opposite direction of the radiation field,thereby reducing the proportion of scattered neutrons in the radiation field.Material thickness,aperture size,and the optimum structure of the capture cave were simulated using MCNP.The design features a neutron emission angle within a range of 3° and neutron fluxes in the radiation field,which are higher by two orders of magnitude than those outside the radiation field.This research has practical value for the generation of monoenergetic small-angle neutron sources and neutron applications.To obtain a small-angle monoenergetic neutron source,a shielding collimator device is designed for the neutron source generated by a neutron tube.The device is divided into the collimator and the capture cave.The collimator is made of three layers of stainless steel and borated polyethylene and is used to constrain neutrons in a small angle.The capture cave is used to increase the number of times neutron inelastic scattering occurs in the opposite direction of the radiation field,thereby reducing the proportion of scattered neutrons in the radiation field.Material thickness,aperture size,and the optimum structure of the capture cave were simulated using MCNP.The design features a neutron emission angle within a range of 3° and neutron fluxes in the radiation field,which are higher by two orders of magnitude than those outside the radiation field.This research has practical value for the generation of monoenergetic small-angle neutron sources and neutron applications.

关 键 词：小角度 中子 设备 设计 防护 不锈钢 聚乙烯 俘获 

分 类 号：O571.53[理学—粒子物理与原子核物理]