MRADSIM-Converter: A new software for STEP to GDML conversion

Radiation effects analysis of instruments operative in harsh radiation environment is crucial for performance and functionality of electronic devices and components. Engineering design of instruments is usually carried out in Computer Aided Design (CAD) engineering software. Geant4-based Monte Carlo codes are extensively used for particle transport simulation and analysis. However, Geant4 is not prepared to accept CAD Standard for The Exchange of Product data (STEP) format. MRADSIM-Converter is a new software for STEP to Geometry Description Markup Language (GDML) format conversion, readable by Geant4-based Monte Carlo codes. Its validation with two different converters confirms its higher speed for importing CAD geometries with arbitrary size and complexity having a user-friendly interface for modifying volumes properties.在强辐射环境中运行的仪器的辐射效应分析，对于电子器件与组件的性能与功能至关重要。仪器的工程设计通常借助计算机辅助设计（Computer Aided Design，CAD）工程软件开展。基于Geant4的蒙特卡罗代码被广泛应用于粒子输运模拟与分析。然而，Geant4无法兼容产品数据交换标准（Standard for The Exchange of Product data，简称STEP）格式。MRADSIM-Converter是一款新型软件，可实现STEP格式到几何描述标记语言（Geometry Description Markup Language，GDML）格式的转换，该格式可被基于Geant4的蒙特卡罗代码读取。经与两款不同转换器进行验证，结果表明该软件在导入任意尺寸与复杂度的CAD几何模型时速度更快，且具备可修改几何体属性的友好用户界面。