The production, application, and/or measurement of polarised X-/gamma rays are key to the fields of synchrotron science and X-/gamma-ray astronomy. The design, development and optimisation of experimental equipment utilised in these fields typically relies on the use of Monte Carlo radiation transport modelling toolkits such as Geant4. In this work the Geant4 “G4LowEPPhysics” electromagnetic physics constructor has been reconfigured to offer a best set of electromagnetic physics models for studies exploring the transport of low energy polarised X-/gamma rays. An overview of the physics models implemented in “G4LowEPPhysics”, and it’s experimental validation against Compton X-ray polarimetry measurements of the BL38B1 beamline at the SPring-8 synchrotron (Sayo, Japan) is reported. “G4LowEPPhysics” is shown to be able to reproduce the experimental results obtained at the BL38B1 beamline (SPring-8) to within a level of accuracy on the same order as Geant4’s X-/gamma ray interaction cross-sectional data uncertainty (approximately $\pm$ 5 %).

偏振 X 射线/伽马射线的产生、应用和/或测量是同步加速器科学和 X 射线/伽马射线天文学领域的关键。在这些领域中使用的实验设备的设计、开发和优化通常依赖于使用 Monte Carlo 辐射传输建模工具包，例如 Geant4。在这项工作中，Geant4“G4LowEPPhysics”电磁物理构造函数已经过重新配置，为研究低能极化 X 射线/伽马射线的传输提供了一组最佳的电磁物理模型。报告了在“G4LowEPPhysics”中实现的物理模型的概述，以及它对 SPring-8 同步加速器（日本萨约）BL38B1 光束线的康普顿 X 射线偏振测量的实验验证。$\pm$ 5%）。