isotopic composition meaning in Chinese

同位素成分
同位素组成

It is important to avoid the use of uranium compounds of unspecified isotopic composition .
要避免使用那种非专用的同位素成份的铀化合物。
How could such a change in isotopic composition have come about
同位素的组成有这样的变化，究竟是如何发生的？
Method for the analysis of the organic matters for stable carbon isotopic composition
有机质稳定碳同位素组成分析方法
Study on the sulfur isotopic compositions of lead - zinc deposits in northwestern guizhou province
黔西北地区铅锌矿硫同位素特征研究
Determination of the noble gas isotopic composition in rocks and minerals by mass spectrometry
岩矿样品中稀有气体同位素组成的质谱分析

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