Transmission calculation by empirical numerical model and Monte Carlo simulation in high energy proton radiography of thick objects  

作　　者：郑娜 许海波 

机构地区：[1]Institute of Applied Physics and Computational Mathematics

出　　处：《Chinese Physics C》2015年第10期127-130,共4页中国物理C（英文版）

基　　金：Supported by NSAF(11176001);Science and Technology Developing Foundation of China Academy of Engineering Physics(2012A0202006)

摘　　要：An empirical numerical model that includes nuclear absorption, multiple Coulomb scattering and energy loss is presented for the calculation of transmission through thick objects in high energy proton radiography. In this numerical model the angular distributions are treated as Gaussians in the laboratory frame. A Monte Carlo program based on the Geant4 toolkit was developed and used for high energy proton radiography experiment simulations and verification of the empirical numerical model. The two models are used to calculate the transmission fraction of carbon and lead step-wedges in proton radiography at 24 GeV/c, and to calculate radial transmission of the French Test Object in proton radiography at 24 GeV/c with different angular cuts. It is shown that the results of the two models agree with each other, and an analysis of the slight differences is given.An empirical numerical model that includes nuclear absorption, multiple Coulomb scattering and energy loss is presented for the calculation of transmission through thick objects in high energy proton radiography. In this numerical model the angular distributions are treated as Gaussians in the laboratory frame. A Monte Carlo program based on the Geant4 toolkit was developed and used for high energy proton radiography experiment simulations and verification of the empirical numerical model. The two models are used to calculate the transmission fraction of carbon and lead step-wedges in proton radiography at 24 GeV/c, and to calculate radial transmission of the French Test Object in proton radiography at 24 GeV/c with different angular cuts. It is shown that the results of the two models agree with each other, and an analysis of the slight differences is given.

关 键 词：proton radiography angular distributions scattering GAUSSIANS GEANT4 TRANSMISSION 

分 类 号：O572.2[理学—粒子物理与原子核物理]