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

• Published in: Chinese physics C Vol. 39; no. 10; pp. 127 - 130
• Main Author: 郑娜 许海波
• Format: Journal Article
• Language: English
• Published: 01.10.2015
• Subjects: Carbon; Computer simulation; Empirical analysis; Energy transmission; Gaussian; Geant4; Mathematical models; Monte Carlo methods; Radiography; 传输; 数值模型; 蒙特卡罗模拟; 蒙特卡罗程序; 计算; 质子照相; 高能量
• ISSN: 1674-1137; 0254-3052
• DOI: 10.1088/1674-1137/39/10/108201

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.