measurement of the amount of radioactive material (usually carbon 14) that an object contains; can be used to estimate the age of the object
例句与用法
1.
Radioactive dating showed the crystals from western australia varied in age from 3 . 06billion to 4 . 25billion years ， making them almost 1billion years older than the previous oldest - knowndiamonds 放射性断代测出来自澳大利亚西部的这种晶体在30 . 6亿到42 . 5亿年前间发生变化，这比之前已知最古老的钻石还早10亿年左右。
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