potassium-40
plural of auslese
(intransitive) To increase over a period of time; to accumulate. / (transitive) To make an untidy pile of (something).
(physics) A naturally-occurring radioactive isotope of potassium, ⁴⁰₁₉K, having nineteen protons and twenty-one neutrons, and a half-life of 1.3 billion years; it is the chief source of natural radioactivity in living tissue
plural of forecaster
岩石試料の測定でカリウム40の痕跡が検出され、地質学者はその年代を推定することができた。
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