# 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 (2): 28

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH •

### A modified multi-group model of angular and momentum distribution of cosmic-ray muons for thickness measurement and material discrimination of slabs

Sa Xiao 1, Wei-Bo He 1, Ming-Cong Lan 1, Ying Chen1, Mao-Bing Shuai 1,2

1. 1 Institute of Materials, China Academy of Engineering Physics, Jiangyou 621907, China
2 Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621900, China
• Contact: Mao-Bing Shuai E-mail:shuaimaobing@caep.cn
• Supported by:

This work was supported by the Science and Technology Development Foundation of CAEP (No. 2015B0103014) and the National Natural Science Foundation of China (No. 11605163).

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Sa Xiao, Wei-Bo He, Ming-Cong Lan, Ying Chen, Mao-Bing Shuai. A modified multi-group model of angular and momentum distribution of cosmic-ray muons for thickness measurement and material discrimination of slabs.Nuclear Science and Techniques, 2018, 29(2): 28

Abstract:

Muon tomography is a capable imaging technique to measure the geometry of high-Z objects. However, most existed algorithms used in muon tomography have obscured the effects of angular distribution and momentum spectra of cosmic ray muons and reduced the spatial resolution. We present a modified multi-group model that takes into account these effects and calibrates the model by the material of lead. Performance tests establish that the model is capable of measuring the thickness of a Pb slab and identifying the material of an unknown slab on a reasonable exposure timescale, in both cases of complete and incomplete angular data. Results show that the modified multi-group model is helpful for improvements in image resolution in real applications.