用校正质谱法测量铕同位素丰度的研究

Determination of Isotopic Abundance of Europium by Calibrating Mass Spectrometry

摘要: 用确定化学纯度的151Eu、153Eu两种浓缩同位素配成9个混合样品，用来测量质谱计系统误差的校正系数，以校正用该仪器测出的矿样和试剂样中铕同位素丰度比，求出铕同位素丰度的绝对值分别是47．810（42）at．％151Eu和52．190（42）at．％153Eu。用该值和已知的铕的核素质量，计算得到铕的原子量为151．9644（9），被定为新的国际标准值。

Abstract: Nine synthetic mixtures prepared from two highly enriched isotopes of europium in the form of well-defined pure sesquioxide served to calibrate the mass spectrometer,the absolute isotopic abundance ratios of europium in 8 samples from various origins are de-termined by calibrating mass spectrometer,vielding absolute isotopic composition of 47.810 (42)at. %151 Eu and 52. 190 (42)at. %,153,Eu. The atomic weight of europium is 151.9644(9) with error giver as 2σ. The atomic weight is accepted as a new international standard value.