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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Effect of the electron transport through thin slabs on the simulation of linear electron accelerators of use in therapy: A comparative study of various Monte Carlo codes
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Effect of the electron transport through thin slabs on the simulation of linear electron accelerators of use in therapy: A comparative study of various Monte Carlo codes

机译：电子通过薄板的传输对线性电子加速器在治疗中的模拟的影响：各种蒙特卡洛代码的比较研究

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摘要

When a therapeutic electron linear accelerator is simulated using a Monte Carlo (MC) code, the tuning of the initial spectra and the renormalization of dose (e.g., to maximum axial dose) constitute a common practice. As a result, very similar depth dose curves are obtained for different MC codes. However, if renormalization is turned off, the results obtained with the various codes disagree noticeably. The aim of this work is to investigate in detail the reasons of this disagreement. We have found that the observed differences are due to non-negligible differences in the angular scattering of the electron beam in very thin slabs of dense material (primary foil) and thick slabs of very low density material (air). To gain insight, the effects of the angular scattering models considered in various MC codes on the dose distribution in a water phantom are discussed using very simple geometrical configurations for the LINAC. The MC codes PENELOPE 2003, PENELOPE 2005, GEANT4, GEANT3, EGSnrc and MCNPX have been used.
机译：当使用蒙特卡罗（MC）代码模拟治疗性电子线性加速器时，初始频谱的调整和剂量的重新归一化（例如，调整为最大轴向剂量）是一种常见的做法。结果，对于不同的MC代码获得了非常相似的深度剂量曲线。但是，如果关闭了重新规范化，则使用各种代码获得的结果将明显不同。这项工作的目的是详细研究这种分歧的原因。我们发现，观察到的差异是由于在致密材料的极薄板（主箔）和极低密度的材料（空气）的厚板中电子束的角度散射的不可忽略的差异引起的。为了获得洞察力，使用非常简单的LINAC几何构型讨论了各种MC代码中考虑的角散射模型对水体模中剂量分布的影响。使用了MC代码PENELOPE 2003，PENELOPE 2005，GEANT4，GEANT3，EGSnrc和MCNPX。

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