摘要
硼硅酸盐玻璃是现有综合性能最好的深地处置高放废物固化材料,其辐照稳定性是影响放射性核素向生物圈泄漏的重要因素。对此,在室温下分别以8 kGy和800 kGy的γ射线辐照三组分硼硅酸盐玻璃(NBS),并对辐照后的样品在不同时间下的浸出行为展开研究。采用光学显微镜和扫描电子显微镜(SEM)对实验样品的表面形貌进行分析,利用能量色散X射线谱仪(EDS)分析元素分布,并用电感耦合-等离子体光发射光谱仪(ICP-OES)对溶液元素进行表征。结果表明:γ射线在8~800 kGy的吸收剂量范围内会对硼硅酸盐玻璃的浸出行为产生影响。此外,随着腐蚀时间的延长,玻璃腐蚀效应逐渐覆盖了辐照效应。与8 kGy辐照相比,NBS玻璃样品在800 kGy辐照下的元素行为变化更为明显。在高剂量辐照后,腐蚀对表面形貌的影响更为显著,而腐蚀7 d后NBS玻璃的元素浸出率更高。
Borosilicate glass is currently the best comprehensive solidified material for deep disposal of high-level radioactive waste.The stability of borosilicate glass under irradiation is an important factor affecting the leakage of radioactive isotopes into the biosphere.In this study,three-component borosilicate glass(NBS)was irradiated byγ-rays at doses of 8 kGy and 800 kGy,respectively.The leaching behaviors of the irradiated samples at different absorbed doses were studied.The surface morphologies of the samples were analyzed using optical microscopy and scanning electron microscopy(SEM).The distributions of elements were analyzed using energy dispersive X-ray spectroscopy(EDS),and the elements in solution were characterized using inductively coupled plasma-optical emission spectroscopy(ICP-OES).The results indicate that the irradiation effects on the leaching behavior of borosilicate glass occurs at certain thresholds.When the corrosion time is prolonged,the corrosion effect gradually covers the irradiation effect of the glass.Compared with 8 kGy irradiation,NBS glass samples exhibit more significant changes in elemental behavior under 800 kGy irradiation.After high-dose irradiation,the effect of corrosion on surface morphology is more significant than at low doses,and the element leaching rate of NBS glass is higher after 7 days of corrosion.
作者
牛书通
王相龙
凌永生
单卿
史潮
贾文宝
张建东
NIU Shutong;WANG Xianglong;LING Yongsheng;SHAN Qing;SHI Chao;JIA Wenbao;ZHANG Jiandong(China National Nuclear Corporation 404 Co.,Ltd,Jiayuguan 735100,China;School of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
2024年第2期42-50,共9页
Journal of Radiation Research and Radiation Processing
基金
国家自然科学基金(12305305)
中国博士后科学基金(2023M731657)资助。
关键词
γ
辐照
硼硅酸盐玻璃
表面形貌
元素浸出
Gamma irradiation
Borosilicate glass
Surface morphology
Elemental leaching
