MC法校正高能X射线核燃料组件无损检测系统散射  

Scattered Ray Correction for High-Energy X-Ray Nondestructive Testing System for Nuclear Fuel Assemblies Based on MC Method

作　　者：钟挚 何高魁[1] 张向阳[1] ZHONG Zhi;HE Gaokui;ZHANG Xiangyang(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《同位素》2024年第3期274-279,共6页Journal of Isotopes

摘　　要：高能X射线无损检测技术能在不破坏检测物体的前提下获取其内部结构信息。核燃料组件的多棒束特性导致产生的散射射线严重影响检测图像质量。为了校正散射射线的干扰,本研究分析了多种解决散射射线干扰的方法在核燃料组件无损检测中的局限性,使用Geant4仿真模拟核燃料组件无损检测过程,构建ComptonFlag类标记发生康普顿散射的散射射线并去除其干扰。模拟结果表明,在去除散射射线干扰后,投影图像中的缺陷与完整燃料棒的对比度信噪比提高了69.02%,能有效提升核燃料组件无损检测图像质量。High energy X-ray non-destructive testing technology can obtain the internal structure information of the inspected object without destroying it.The multi-rod-beam nature of nuclear fuel assemblies can lead to severe scattering ray effects,which can degrade image quality.In order to correct the interference of scattering ray,this study analyzed the limitations of various methods to solve the interference of scattered rays in the non-destructive testing of nuclear fuel assemblies.Geant4 is used to simulate the nondestructive testing process of nuclear fuel components,and ComptonFlag class is constructed to mark the scattered rays of Compton scattering and remove their interference.The simulation results show that the CNR of defective and intact components in the projection image is increased by 69.02%after the scattering ray interference is removed,which can effectively improve the image quality of non-destructive testing of nuclear fuel assemblies.

关 键 词：核燃料组件 高能X射线无损检测 散射 MC法 GEANT4 

分 类 号：TL99[核科学技术—核技术及应用]