Physical design of conversion screens for thermal neutron transmission imaging

LIU Xingyu; YU Xiaoxue; LI Hangzhou; PENG Jinqiu; YANG Xu; WU Kang; BAI Xiaohou; WANG Junrun; DENG Zhiyong; WU Lu; GAO Gentao; WAN Guorong; LIU Li; HE Peng; ZHANG Yun; ZHANG Yu; YAO Zeen; WEI Zheng

doi:10.11889/j.0253-3219.2023.hjs.46.110203

He jishu (Nov 2023)

Physical design of conversion screens for thermal neutron transmission imaging

LIU Xingyu,
YU Xiaoxue,
LI Hangzhou,
PENG Jinqiu,
YANG Xu,
WU Kang,
BAI Xiaohou,
WANG Junrun,
DENG Zhiyong,
WU Lu,
GAO Gentao,
WAN Guorong,
LIU Li,
HE Peng,
ZHANG Yun,
ZHANG Yu,
YAO Zeen,
WEI Zheng

Affiliations

LIU Xingyu: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
YU Xiaoxue: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
LI Hangzhou: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
PENG Jinqiu: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
YANG Xu: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
WU Kang: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
BAI Xiaohou: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
WANG Junrun: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
DENG Zhiyong: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
WU Lu: Nuclear Power Institute of China, Chengdu 610213, China
GAO Gentao: Nuclear Power Institute of China, Chengdu 610213, China
WAN Guorong: Nuclear Power Institute of China, Chengdu 610213, China
LIU Li: Nuclear Power Institute of China, Chengdu 610213, China
HE Peng: Nuclear Power Institute of China, Chengdu 610213, China
ZHANG Yun: Nuclear Power Institute of China, Chengdu 610213, China
ZHANG Yu: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
YAO Zeen: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
WEI Zheng: School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

DOI: https://doi.org/10.11889/j.0253-3219.2023.hjs.46.110203
Journal volume & issue: Vol. 46, no. 11
pp. 110203 – 110203

Abstract

Read online

BackgroundAlthough the neutron image conversion screen is a key component of thermal neutron radiograph, its parameters can severely affect both the spatial resolution and thermal neutron-photon conversion efficiency.PurposeThis study aims to design a neutron image conversion screen for a thermal neutron transmission imaging system based on a compact D-D neutron source.MethodsFirstly, the Geant4 (Geometry and Tracking) program was used to simulate the physical process of thermal neutron transmission imaging and two-dimensional images of transmitted photons, and establish a thermal neutron radiography model based on LiF(ZnS) and LiF(GOS) image conversion screens, and the Siemens star image indicator model. Then, the line spread function (LSF) was employed to calculate spatial position resolution of neutron transmission imaging, and the relationships between the thickness of thermal neutron image conversion screens and the spatial resolution, as well as that between the thickness of thermal neutron image conversion screens and neutron-photon conversion efficiency were evaluated and calculated. Finally, based on parameters of thermal neutron radiography imaging system based on compact D-D neutron source at Lanzhou University, recommended thicknesses for LiF(ZnS) and LiF(GOS) conversion screens were applied to the spatial resolution test experiments.ResultsThe recommended thicknesses for LiF(GOS) and LiF(ZnS) image conversion screens are 40 μm and 80 μm, respectively, the spatial resolution of the thermal neutron radiography reach 45 and 63 μm, respectively, and the neutron-photon conversion efficiencies are 136.34 and 126.81, respectively.ConclusionsThis study lays the technical basis for the development of a thermal neutron radiography based on compact D-D neutron sources. It may be also applicable to other thermal neutron imaging systems.

Published in He jishu

ISSN: 0253-3219 (Print)
Publisher: Science Press
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: https://www.hjs.sinap.ac.cn/

About the journal

Abstract

Keywords