noun
radiometric dating
Scientific term for determining the age of materials by measuring radioactive decay.
この化石の年代は放射年代測定で調べられた。
The age of this fossil was investigated using radiometric dating.
Specifically radiocarbon dating, a type of radiometric dating using carbon-14.
Compound of 放射 (radiation) + 年代 (age, era) + 測定 (measurement).