The point kernel integration method is commonly utilized for the analytical calculation of gamma radiation fields in the field of radiation protection and shielding design. This study introduces NPTS-PK, a program developed for rapid calculation of 3D gamma radiation fields based on the NPTS program and the point kernel integration method. Based on the geometric construction and input method of the NPTS program, NPTS-PK supports point kernel calculations for radiation sources and shielding structures of various complex shapes and materials. By calculating material attenuation coefficients using continuous energy cross-section parameters, combined with a more precise buildup factor calculation method, the accuracy of calculation results has been enhanced. Improvements in ray tracing processes and the implementation of the probability neighbor list method have accelerated geometric processing. To address the challenge of excessive computation time associated with large-scale grid counting in point kernel programs, NPTS-PK integrates several efficient acceleration techniques, elevating the speed of radiation field calculation by an order of magnitude. Tests on typical model and engineering scenario demonstrate that the deviation between NPTS-PK results and the reference values is within a few tens of percent, and the computational efficiency and accuracy are improved compared to the standard point kernel programs.

中文翻译：

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NPTS-PK：用于快速计算 3D 伽马辐射场的新点核代码


点核积分方法通常用于辐射防护和屏蔽设计领域中伽马辐射场的分析计算。本研究介绍了 NPTS-PK，这是一个基于 NPTS 程序和点核集成方法为快速计算 3D 伽马辐射场而开发的程序。NPTS-PK 基于 NPTS 程序的几何构造和输入方法，支持各种复杂形状和材料的辐射源和屏蔽结构的点核计算。通过使用连续能量截面参数计算材料衰减系数，结合更精确的累积系数计算方法，提高了计算结果的准确性。光线追踪过程的改进和概率邻域列表方法的实现加速了几何处理。为了解决点核程序中与大规模网格计数相关的计算时间过长的挑战，NPTS-PK 集成了多种高效的加速技术，将辐射场计算的速度提高了一个数量级。在典型模型和工程场景下的测试表明，NPTS-PK 结果与参考值的偏差在几十个百分点以内，与标准点核程序相比，计算效率和精度都有所提高。