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@30sec_physics: なぜ古代の骨を見るだけで3,300年前のものとわかるのか。 答えは炭素原子の放射性崩壊にある。 宇宙線が大気中の窒素に当たると放射性の炭素14(C-14)が生まれ、生き物はこれを体に取り込み大気と同じ比率を保つ。 死んだ瞬間から炭素14は半減期5,730年で静かに減り続け、補充されない。 残量と元の比率を比較すれば何年前かが計算できる。 この放射性炭素年代測定法は1949年にウィラード・リビーが発見し1960年ノーベル化学賞を受賞。 最大約5万年前まで測定可能な考古学・地球科学の標準手法。 #放射性炭素年代測定 #炭素14 #物理 #科学 #雑学 #shorts #物理雑学 #サイエンス #放射線 #原子

30秒物理
30秒物理
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Monday 15 June 2026 09:15:22 GMT
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