基于自适应源项离散的点核积分方法计算效率优化研究

Calculation efficiency optimization of point kernel integration methodbased on adaptive source term split up

点核积分方法面对多源项的复杂场景或是需要对辐射场进行动态更新的情形存在计算耗时较长的问题。针对该问题,通过点核积分程序CIRPDose对圆柱体源、长方体源等5类源项离散引起的误差随计算点与源距离的变化规律进行模拟计算,并提出了一种基于自适应源项离散的点核积分计算效率优化方法。在将该方法集成到CIRPDose程序后,通过自定义算例对其进行测试,测试结果显示,相比传统的固定离散数目,各类型源项在自适应离散方法下的辐射场计算用时最大缩短96.77%,且计算结果平均偏差最大值仅为3.19%,验证了所提方法的可靠性和有效性。研究工作可为核设施内的三维γ辐射场快速计算提供技术支持。

The point kernel integration method has the problem that it takes a long time to calculate complex scene with multiple source terms or the situation that the radiation field needs to be dynamically updated.To solve this problem,this study employs the point kernel integration program CIRPDose to simulate and calculate the variation law of errors resulting from the split up of source terms(a total of five types,including cylindrical source and cuboid source,etc.)in relation to the distance between the calculated point and the source,and proposes an efficiency optimization method for the point kernel integration based on adaptive source term split up.After integrating the method into the CIRPDose program,the method was tested through customized examples.The test results show that the calculation time of radiation field for each type of source term under the adaptive split up method is reduced by 96.77%,as opposed to the conventional fixed number split up method.Moreover,the maximum average deviation in the calculated results is only 3.19%,which verifies the reliability and effectiveness of the proposed method.The research presented in this paper can provide technical support for the rapid calculation of 3D gamma radiation fields in nuclear facilities.