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radioactive dating 【地質學;地理學】放射衰變年代鑒定。

radioactive decay

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 放射性斷代測出來自澳大利亞西部的這種晶體在30 . 6億到42 . 5億年前間發生變化,這比之前已知最古老的鉆石還早10億年左右。