An enhanced differential evolution-based inverse radiation transport model for identification of unknown shielding layer thicknesses with gamma-ray spectrum  

作　　者：Ying Chen Lian-Ping Zhang Xue Sai Meng-Fu Wei Lun-Qiang Wu Jian-Min Hu 

机构地区：[1]Institute of Materials,China Academy of Engineering Physics [2]Science and Technology on Surface Physics and Chemistry Laboratory

出　　处：《Nuclear Science and Techniques》2017年第6期161-168,共8页核技术（英文）

基　　金：supported by the CAEP foundation for Development of Science and Technology(No.2015B0103014);National Natural Science Foundation of China(No.11605163)

摘　　要：Identifying the geometric information of an object by analyzing the detected radiation fields is an important problem for national and global security.In the present work,an inverse radiation transport model,based on the enhanced differential evolution algorithm with global and local neighborhoods(IRT-DEGL),is developed to estimate the unknown layer thickness of the source/shield system with the gamma-ray spectrum.The framework is briefly introduced with the emphasis on handling the enhanced differential evolution algorithm.Using the simulated gamma-ray spectra,the numerical precision of the IRT-DEGL model is evaluated for one-dimensional source systems.Using the detected gamma-ray spectra,the inverse investigations for the unknown thicknesses of multiple shielding layers are performed.By comparing with the traditional gamma-ray absorption method,it is shown that the IRT-EDGL model can provide a much more accurate result and has great potential to be applied for the complicated systems.Identifying the geometric information of an object by analyzing the detected radiation fields is an important problem for national and global security. In the present work, an inverse radiation transport model, based on the enhanced differential evolution algorithm with global and local neighborhoods (IRT-DEGL), is developed to estimate the unknown layer thickness of the source/shield system with the gamma-ray spectrum. The framework is briefly introduced with the emphasis on handling the enhanced differential evolution algorithm. Using the simulated gamma-ray spectra, the numerical precision of the IRT-DEGL model is evaluated for one-dimensional source systems. Using the detected gamma-ray spectra, the inverse investigations for the unknown thicknesses of multiple shielding layers are performed. By comparing with the traditional gamma-ray absorption method, it is shown that the IRT-EDGL model can provide a much more accurate result and has great potential to be applied for the complicated systems.

关 键 词：INVERSE RADIATION transport y SPECTROMETRY Multi-shielding layers Differential evolution with local and global neighborhoods 

分 类 号：TL816.2[核科学技术—核技术及应用]