isotope analysis

例句：

1. 1. The team conducted an isotopic analysis of the water samples to determine their origins.
   该团队对水样进行了同位素分析，以确定其来源。
2. 2. The researcher used a mass spectrometer for isotopic analysis to identify the elements in the sample.
   研究者使用质谱仪进行同位素分析，以识别样本中的元素。
3. 3. The isotopic analysis revealed that the uranium-plutonium mixture was not as pure as initially thought.
   同位素分析显示，铀-钚混合物并不像最初认为的那样纯净。