气体采样中的氪和氙同位素比值产生了一个令人吃惊的结果：这些比值跟在形成太阳系的原始云团中所发现的比值不一致。
The krypton and xenon isotope ratios in the gas samples provided a surprising result: They did not match the ratios found in the primordial cloud that spawned the solar system.
由于氙是惰性的，不易与其他元素产生化学键，因此很容易纯化以进行同位素分析。
Being a noble gas, it resists chemical bonding with other elements and is thus easy to purify for isotopic analysis.
然而，有些含氙同位素的矿物并非如此，是由铀的放射性衰变产生的。
However, some of the minerals contain xenon isotopes unlike those usually produced by radioactive decay of uranium.
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