radiometric
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/ˌreɪdiəʊˈmetrɪk/
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/ˌreɪdiəʊˈmetrɪk/
involving the measurement of radiation, such as radioactivity, to determine the age of materials or the properties of objects
The geologist used radiometric dating to determine the age of the ancient rock layers.
地理学者は放射性年代法を使用して古代の岩層の年齢を決定しました。