isotopic source

例句：

1. 1. The isotopic analysis of the sample revealed significant differences in the isotopic ratios.
   对样本的同位素分析显示了显著不同的同位素比例。
2. 2.The discovery of new isotopes has opened up new possibilities for scientific research.
   新同位素的发现为科学研究开辟了新的可能性。
3. 3. The isotopic composition of the water samples was studied to determine their origins and potential uses.
   研究了水样中的同位素组成，以确定其来源和潜在用途。