... radioactive debris 放射性碎片 radioactive dating 放射性测定年龄 radioactive contamination 放射性污染 ...
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不同的实验室正在对这些猛犸象骨骼进行放射性碳测定，以更加精确地得知这些化石的年龄。
Various labs are doing radiocarbon-dating of the bones to more precisely date them.
因为它是稀有天然放射性同位素钾衰变而产生的，所以可以用来测定十万年以上的岩石年龄和采样。
Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope, it can be used to date rocks and samples more than 100,000 years old.
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