Karam L R, Pibida L, McMahon C A
Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8462, USA.
Appl Radiat Isot. 2002 Jan-Feb;56(1-2):369-74. doi: 10.1016/s0969-8043(01)00216-0.
A method to quantitatively determine the radionuclidic content of complex samples with a minimum of chemical preparation has been under development at the National Institute of Standards and Technology (NIST). Based on earlier studies with resonance ionization mass spectrometry (RIMS), a graphite furnace was added to the RIMS system at NIST. Efficiency determinations for 133Cs in solution and isotopic ratio measurements of cesium (135Cs/137Cs) for an NIST nuclear burn-up sample using RIMS and for a sediment natural matrix standard using thermal ionization mass spectrometry are presented.
美国国家标准与技术研究院（NIST）一直在开发一种方法，该方法能够在最少化学制备的情况下定量测定复杂样品中的放射性核素含量。基于早期对共振电离质谱法（RIMS）的研究，NIST在RIMS系统中添加了一个石墨炉。本文介绍了使用RIMS对溶液中的133Cs进行效率测定，以及对NIST核燃耗样品进行铯同位素比（135Cs/137Cs）测量，同时还介绍了使用热电离质谱法对沉积物天然基质标准进行铯同位素比测量的情况。
