# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (8): 119

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

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

Wen-Hui Lü 1,2 · Hui-Ping Guo 1 · Ning Lü 1 · Kuo Zhao 1 · Xiao-Tian Wang 1 · Yi-Jie Hou 1

1. 1 Xi’an Research Institute of Hi-Tech, Xi’an 710025, China
2 Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100083, China
• Contact: Wen-Hui Lv E-mail:lvmh14@mails.tsinghua.edu.cn
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Wen-Hui Lü, Hui-Ping Guo, Ning Lü, Kuo Zhao, Xiao-Tian Wang, Yi-Jie Hou. Design of a shielding collimator device for a small-angle monoenergetic neutron source.Nuclear Science and Techniques, 2018, 29(8): 119

Abstract:

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.