Influence of multiple Coulomb scattering on accuracy of muon transmission imaging of small-scale matter

• DOI: 10.7498/aps.72.20221792
• Publication Date: 2022-10-19T07:15:38Z
• Authors: Jian-Ming Zhang; Zhi-Wei Li; Fang Liu; Jing-Tai Li; Xin Mao; Ya-Ping Cheng; Jie Pang; Xin-Zhuo Feng; Si-Dao Ni; Xiao-Ping Ouyang; Ran Han

The muon transmission imaging method is a non-destructive detection and can obtain the internal density structure of target object by analyzing flux change cosmic ray before after passing through object. This assumes that travels along straight line in lowatomic number material. However, multiple Coulomb scattering causes deviate from to certain extent when penetrating material, which may have influence on accuracy imaging. study uses Geant4 software package carry out Monte Carlo simulation Object models with structures several meters are used analyze effect In experiment, we set up model muons different energy vertically pass rock thickness, intuitively see penetration path muons. By setting rock-water block thickness range 0.8, 2.4 4.0 m, small-scale material analyzed. results suggest well restore geometric shape spatial distribution characteristics anomalies for objects several-meter scale standard materials meters. deviation caused near-vertical direction reach 5%, 13% boundary areas air. We limit angle muon, select less than or equal 1° using selected improved. image does not illusion an abnormally increased around scattering, but area reduced even more, thereby affecting restoring absolute differences. Therefore, effects should be considered recovering more accurate study.