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

作者：Xiao, Sa; He, Wei-Bo; Lan, Ming-Cong; Chen, Ying; Shuai, Mao-Bing^*

来源：Nuclear Science and Techniques, 2018, 29(2): 28.

DOI：10.1007/s41365-018-0363-7

• Muon tomography
• Modified multi-group model
• Angular distribution
• Momentum spectra

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.

• 出版日期2018-2
• 单位中国工程物理研究院