EPOTRAN: A full-differential Monte Carlo code for electron and positron transport in liquid and gaseous water
EPOTRAN: A full-differential Monte Carlo code for electron and positron transport in liquid and gaseous water
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DOI：
10.3109/09553002.2011.641451
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发表时间：
2012-01-01
影响因子：
2.6
通讯作者：
Stosic, Borko
中科院分区：
文献类型：
--
作者：
Champion, Christophe;Le Loirec, Cindy;Stosic, Borko
目的：在这里，我们描述了一种新的全差分蒙特卡罗（MC）事件的模拟，模拟电子和正电子的历史，在液态和气态水，与冲击能量范围从水的激发阈值（7.4 eV）到10千电子伏。这种新的轨道结构的代码被命名为EPOTRAN，电子和正电子TRANSPORT在water.Material和方法的首字母缩写：所有的过程中引起的电子和正电子的详细研究，通过理论微分和总截面，计算在量子力学框架内使用分波方法。弹性和非弹性的相互作用，然后连续审查，特别是包括一个原始的描述正电子诱导的捕获过程导致Positronium formation.Results：总截面和微分截面的报告，并与一个大的现有的测量。相当好的协议，一般观察所考虑的能量range.Conclusions：这项工作报告的理论截面中使用的一个特殊目的的Monte Carlo模拟适合于电子和正电子在气态和液态水的运输。这MC代码应代表一个精确的工具，剂量计算在纳米尺度上，通过提供一个详细的空间分布的能量存款。此外，正电子轨迹的研究可能通过这种方法应该证明是有用的，用于评估的真实的贡献的正电子范围的整体空间分辨率的PET（正电子发射断层扫描）成像。
Purpose: We describe here a novel full-differential Monte Carlo (MC) event-by-event simulation, for modelling electron and positron histories in liquid and gaseous water, with impact energies ranging from the water excitation threshold (7.4 eV) to 10 keV. This new track-structure code is named EPOTRAN, an acronym for Electron and POsitron TRANsport in water.Material and methods: All the processes induced by both electrons and positrons are studied in detail via theoretical differential and total cross sections, calculated within the quantum mechanical framework by using the partial-wave method. Elastic and inelastic interactions are then successively reviewed, including in particular an original description of the positron-induced capture process leading to Positronium formation.Results: Total and differential cross sections are reported and compared with a large set of existing measurements. Rather good agreement is generally observed over the considered energy range.Conclusions: This work reports the theoretical cross sections used in a special purpose Monte Carlo simulation suitable for electron and positron transport in gaseous and liquid water. This MC code should represent an accurate tool for dose calculation at the nanometric scale, by providing a detailed spatial distribution of energy deposits. Furthermore, positron trajectory studies made possible by this approach should prove useful for evaluating the real contribution of the positron range on the overall spatial resolution of PET (Positron Emission Tomography) imaging.