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扫描电子显微镜结合热电离质谱测定单微粒中铀同位素比值

Determination of Uranium Isotope Ratio in Single Particle by Scanning Electron Microscope-Thermal Ionization Mass Spectrometer

    摘要
  • 摘要: 单微粒铀同位素分析是核保障环境监测技术的重要手段。作为现阶段应用最可靠且广泛的微粒分析技术之一，裂变径迹-热电离质谱(FT-TIMS)技术需依赖反应堆辐照，分析步骤繁琐，效率较低。扫描电子显微镜结合热电离质谱（SEM-TIMS）在保持原有TIMS的高测量精密度的同时，由扫描电子显微镜结合X射线能量色散谱仪（SEM-EDX）完成含铀微粒的寻找和鉴别，由微操作系统进行微粒转移，缩短了分析流程，提高了分析效率。本文应用建立的SEM-TIMS分析方法对已知同位素组成的单分散铀氧化物标准微粒进行了测量，测量结果与其标称值一致。

     

    Abstract: The isotope analysis of single uranium-bearing particle is one of the most important techniques in environmental monitoring of nuclear safeguards. As a reliable and routine technique, the fission track-thermal ionization mass spectrometer (FT-TIMS) is complex and time-consuming. The scanning electron microscope-thermal ionization mass spectrometer (SEM-TIMS) is more efficient because the uranium-bearing particles are searched by SEM equipped with an energy dispersive X-ray (EDX) detector and transferred by micromanipulation which could simplify the procedure and save time. In this paper, the SEM-TIMS was introduced and monodisperse uranium oxide particles of known isotopic composition were measured by this approach. The result shows a good agreement with certified values.

     

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