放ほう射しゃ年ねん代だいほうしゃねんだいMeanings1nounradiometric ageTechnical term used in geology, archaeology, and related fields for age determined by radiometric dating methods.この化か石せきの放ほう射しゃ年ねん代だいは約やく1いち万まん年ねん前まえと推すい定