Identification of the unknown shielding parameters with gammaray spectrum using a derivative-free inverse radiation transport model  

作　　者：Ying Chen Lian-Ping Zhang Sa Xiao Lun-Qiang Wu Shan-Li Yang Bing-Yuan Xia Jian-Min Hu 

机构地区：[1]Institute of materials, China Academy of Engineering Physics

出　　处：《Nuclear Science and Techniques》2018年第5期75-81,共7页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.11605163 and 21504085);the China Academy of Engineering Physics Foundation for Development of Science and Technology(No.201580103014 and No.2015B0301063);the Foundation for Special Talents in China Academy of Engineering Physics(No.TP201502-3);the Sichuan Science and Technology Development Foundation for Young Scientists(No.2017Q0050)

摘　　要：Identifying the unknown geometric and material information of a multi-shield object by analyzing the radiation signature measurements is always an important problem in national and global security. In order to identify the unknown shielding layer thicknesses of a source/shield system with gamma-ray spectra, we have developed a derivative-free inverse radiation transport model based on a differential evolution algorithm with global and local neighbourhoods(IRT-DEGL). In the present paper, the IRT-DEGL model is further extended for estimating the unknown thicknesses with random initial guesses and material mass densities of multi-shielding layers as well as their combinations. Using the detected gamma-ray spectra,the illustration of inverse studies is implemented and the main influence factors for inverse results are also analyzed.Identifying the unknown geometric and material information of a multi-shield object by analyzing the radiation signature measurements is always an important problem in national and global security. In order to identify the unknown shielding layer thicknesses of a source/shield system with gamma-ray spectra, we have developed a derivative-free inverse radiation transport model based on a differential evolution algorithm with global and local neighbourhoods(IRT-DEGL). In the present paper, the IRT-DEGL model is further extended for estimating the unknown thicknesses with random initial guesses and material mass densities of multi-shielding layers as well as their combinations. Using the detected gamma-ray spectra,the illustration of inverse studies is implemented and the main influence factors for inverse results are also analyzed.

关 键 词：INVERSE problem DERIVATIVE-FREE INVERSE RADIATION transport model GAMMA-RAY SPECTRUM Multishielding layers 

分 类 号：TL[核科学技术]