元素的同位素比值是元素中各同位素丰度之比。该元素的重同位素原子丰度与轻同位素原子丰度之比。由于同位素比值难以准确测定，因此样品的同位素比值通常用它与某一标准物质的同位素比值的千分差来表示。
...元素;同位素比值 [gap=3236]ological sample; reference material; meteorite;biological sample; trace element; isotope ratio ...
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硫同位素比值 sulfur isotope ratio
氢同位素比值 hydrogen isotope ratio
氮同位素比值 nitrogen isotope ratio
稳定同位素比值质谱仪 Stable Isotope Ratio Mass Spectrometry
碳同位素比值分析 SCIRA
同位素比值法 isotope ratio method
碳同位素比值测定 carbon isotope ratio determination
碳稳定同位素比值 ratio of carbon stable isotope
火星大气的同位素比值 [天] isotopic ratio in Mars atmosphere
壳型花岗岩具较高的铅同位素比值和富铀铅贫钍铅的特点；
The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.
证据就存在于海洋泥土，花粉化石和记录温度变化的化学同位素比值变化之中。
The evidence lies in ocean mud, in fossil pollen, and in changes in ratio of chemical isotopes that record shifts in temperature.
结合低本底化学流程，实现了微量地质样品的高精度同位素比值测试。
Combining chemical separation procedures having low blank, measurements of micro-geological samples have successively been achieved.
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