电子探针显微分析(Electron Probe Micro-Analyze,EPMA)作为一种高空间分辨率的微区分析技术,旨在实现对辐照后核燃料中裂变气体Xe的浓度分布、局部富集及迁移行为的准确分析,并揭示辐照损伤对燃料性能的影响。EPMA通过测量X射线的特征...电子探针显微分析(Electron Probe Micro-Analyze,EPMA)作为一种高空间分辨率的微区分析技术,旨在实现对辐照后核燃料中裂变气体Xe的浓度分布、局部富集及迁移行为的准确分析,并揭示辐照损伤对燃料性能的影响。EPMA通过测量X射线的特征谱线,对Xe进行定性和定量分析,并结合透射电镜(Transmission Electron Microscope,TEM)和二次离子质谱仪(Secondary Ion Mass Spectrometry,SIMS)等其他分析技术,以获取更全面的裂变气体行为信息。本文系统总结近年来EPMA在辐照后核燃料Xe浓度分析中的应用,探讨影响分析准确性的关键因素(如样品制备、仪器参数及数据处理方法等),并评述了提高分析精度的优化方法。通过优化实验条件、改进数据处理算法及结合互补分析技术,可显著提升EPMA的定量准确性。未来,EPMA与其他技术的联用将进一步深化对裂变气体行为的理解,为核燃料性能评估提供更可靠的数据支持。展开更多
A model of intra-grain fission gas bubble growth in U_(3)Si_(2) coupled with defect microstructure is generalized to take into account the influence of point defect sinks and defect clustering.The dynamics of bubble g...A model of intra-grain fission gas bubble growth in U_(3)Si_(2) coupled with defect microstructure is generalized to take into account the influence of point defect sinks and defect clustering.The dynamics of bubble growth and defect structure properties are studied under different irradiation conditions.The influence of temperature and flux on bubble growth,defect ensemble evolution,and changes in material properties(elastic moduli and thermal degradation factor)are examined in detail.The universality of the bubble size distribution and the crossover of dynamical regimes of bubble growth are studied under various irradiation conditions.It is shown that a change in the dominant(fission gas atom-or vacancymediated)mechanism of bubble growth results in a crossover from a parabolic to a sub-parabolic bubble size growth law.The proposed modification of the rate theory model provides more accurate predictions and more detailed insight into fuel performance,especially fission gas behavior in crystalline U_(3)Si_(2).展开更多
文摘电子探针显微分析(Electron Probe Micro-Analyze,EPMA)作为一种高空间分辨率的微区分析技术,旨在实现对辐照后核燃料中裂变气体Xe的浓度分布、局部富集及迁移行为的准确分析,并揭示辐照损伤对燃料性能的影响。EPMA通过测量X射线的特征谱线,对Xe进行定性和定量分析,并结合透射电镜(Transmission Electron Microscope,TEM)和二次离子质谱仪(Secondary Ion Mass Spectrometry,SIMS)等其他分析技术,以获取更全面的裂变气体行为信息。本文系统总结近年来EPMA在辐照后核燃料Xe浓度分析中的应用,探讨影响分析准确性的关键因素(如样品制备、仪器参数及数据处理方法等),并评述了提高分析精度的优化方法。通过优化实验条件、改进数据处理算法及结合互补分析技术,可显著提升EPMA的定量准确性。未来,EPMA与其他技术的联用将进一步深化对裂变气体行为的理解,为核燃料性能评估提供更可靠的数据支持。
基金supported by the Fund from Sichuan Science and Technology Program(Grant No.2024JDHJ0014)the Joint Funds of the National Natural Science Foundation in China(Grant No.U23B2071)the Fund from the Ministry of Education and Science of Ukraine(Grant No.0124U000551)。
文摘A model of intra-grain fission gas bubble growth in U_(3)Si_(2) coupled with defect microstructure is generalized to take into account the influence of point defect sinks and defect clustering.The dynamics of bubble growth and defect structure properties are studied under different irradiation conditions.The influence of temperature and flux on bubble growth,defect ensemble evolution,and changes in material properties(elastic moduli and thermal degradation factor)are examined in detail.The universality of the bubble size distribution and the crossover of dynamical regimes of bubble growth are studied under various irradiation conditions.It is shown that a change in the dominant(fission gas atom-or vacancymediated)mechanism of bubble growth results in a crossover from a parabolic to a sub-parabolic bubble size growth law.The proposed modification of the rate theory model provides more accurate predictions and more detailed insight into fuel performance,especially fission gas behavior in crystalline U_(3)Si_(2).
