基于热电离质谱的单微粒铀同位素分析方法比较  

Comparative Study on Uranium Isotopic Analysis for Single Particle Based on Thermal Ionization Mass Spectrometry

作　　者：王凡[1] 陈彦[1] 张燕[1] 姜小燕[1] 赵永刚[1] 鹿捷 徐常昆[1] 王琛[1] WANG Fan;CHEN Yan;ZHANG Yan;JIANG Xiaoyan;ZHAO Yonggang;LU Jie;XU Changkun;WANG Chen(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：《原子能科学技术》2022年第3期585-590,共6页Atomic Energy Science and Technology

摘　　要：在核保障中,测定擦拭样品单微粒中铀同位素比可为探测未申报或隐匿的核活动提供重要的信息。裂变径迹-热电离质谱(FT-TIMS)是该领域中的主流技术之一,近年来提出了一种新技术——扫描电子显微镜-热电离质谱(SEM-TIMS)。本文通过对标准微粒样品的测定系统评估比较了该两种方法。该两种方法的测量结果均与标准微粒的参考值吻合较好,FT-TIMS易于寻找、定位易裂变核素,对高浓铀具有极高的灵敏度。SEM-TIMS则更易于同步开展含铀微粒形貌学和元素组成等分析,可视作FT-TIMS有益的补充。In nuclear safeguards,measurement of uranium isotope ratio in single particle from swipe samples provides crucial information for detecting undeclared or clandestine activities.Fission track analysis combined with thermal ionization mass spectrometry(FT-TIMS)is one of the dominant techniques in this field.With the development of technique,a new approach,scanning electron microscopy combined with thermal ionization mass spectrometry(SEM-TIMS)was introduced in recent years.Both methods were evaluated by testing the same uranium standard particles in the paper.The result shows a good agreement with certified values.FT-TIMS is prone to identify and locate fissile nuclides and has a high sensitivity for highly enriched uranium(HEU).SEM-TIMS which is compatible with morphological and elemental analysis could be considered as a beneficial supplement for FT-TIMS.

关 键 词：含铀微粒 同位素比 裂变径迹 扫描电子显微镜 热电离质谱 微操作 

分 类 号：TL817[核科学技术—核技术及应用]