基于RMC程序的用康普顿轮廓进行束缚态电子多普勒展宽修正研究
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摘要
堆用蒙特卡罗程序RMC具备中子、光子、电子耦合输运能力,能完成精确的屏蔽计算,其中光子输运过程采用光子数据库进行了康普顿散射模拟。本文对康普顿散射物理原理及多普勒展宽方法进行分析,使用康普顿轮廓数据对束缚态电子进行多普勒展宽修正,实现了RMC程序对自由电子和束缚态电子的选择性处理。通过核素算例测试,观察到了多普勒能谱展宽的效应,证明了该方法的正确性。通过对典型压水堆组件的计算和对比,验证了用康普顿轮廓进行束缚态电子多普勒展宽修正的必要性和正确性。
The Monte Carlo code RMC has the capacity of neutron-photon-electron coupling calculation and can complete the precise shielding calculation.The Compton scattering simulation was carried out in photon transport process with the photon-atomic library.Through the analysis of the Compton scattering physical principle and the Doppler broadening method,the bounding electron Doppler broadening correction was completed with Compton profile and a selective treatment of free electron and bounding electron was achieved by using RMC code.The radionuclide test was carried out to observe the effect of Doppler broadening spectroscopy,and the correctness of the method is proved.Through the calculation and comparison of a typical pressurized water reactor component,the necessity and correctness of the Doppler broadening correction are verified.
The Monte Carlo code RMC has the capacity of neutron-photon-electron coupling calculation and can complete the precise shielding calculation.The Compton scattering simulation was carried out in photon transport process with the photon-atomic library.Through the analysis of the Compton scattering physical principle and the Doppler broadening method,the bounding electron Doppler broadening correction was completed with Compton profile and a selective treatment of free electron and bounding electron was achieved by using RMC code.The radionuclide test was carried out to observe the effect of Doppler broadening spectroscopy,and the correctness of the method is proved.Through the calculation and comparison of a typical pressurized water reactor component,the necessity and correctness of the Doppler broadening correction are verified.
引文
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[2]徐克尊,陈向军,陈宏芳.近代物理学[M].2版.合肥:中国科学技术大学出版社,2008:222-226.
[3]CARTER L L,CASHWELL E D.Particle transport simulation with the Monte Carlo method,TID-26607[R].USA,Los Alamos Scientific Laboratory,1975.
[4]俞飞,顾文颐.康普顿轮廓[J].淮北煤师院学报,1995,16(2):62-65.YU Fei,GU Wenyi.Compton profile[J].Journal of Huaibei Coal Mining Teachers College,1995,16(2):62-65(in Chinese).
[5]CULLEN D E,HUBBELL J H.EPDL97:The evaluated photon data library,97 version,UCRL-50400,Vol.6,Rev.5[R].USA:Lawrence Livermore National Laboratory,1997.
[6]叶辛欧文,刘仕倡,王侃.基于通用型耦合方法蒙特卡罗核热耦合[J].强激光与粒子束,2017,29(1):1-6.YEXIN Ouwen,LIU Shichang,WANG Kan.Research on RMC neutronics-thermal hydraulics coupling based on universal coupling methodology[J].High Power Laser and Particle Beams,2017,29(1):1-6(in Chinese).
[7]卢希庭.原子核物理[M].北京:原子能出版社,2001.
[8]DUMOND J W M.Compton modified line structure and its relation to the electron theory of solid bodies[J].Phys Rev,1929,33:643-658.
[9]DUMOND J W M.The linear momenta of electrons in atoms and in solid bodies as revealed by X-ray scattering[J].Phys Mod Rev,1933,5:1-39.
[10]赵小利.H2及几个烷烃小分子的康普顿轮廓研究[D].合肥:中国科学技术大学,2015.
[11]X-5 Monte Carlo Team.MCNP:A general Monte Carlo N-particle transport code,Version5,LA-UR-03-1987[R].USA:Los Alamos National Laboratory,1987.
[12]KAHN H.Applications of Monte Carlo,AEC-3259[R].USA:The Rand Corporation,1956.
[13]KOBLINGER L.Direct sampling from the KleinNishina distribution for photon energies above1.4 MeV[J].Nucl Sci Eng,1975,56:218-226.