calcium-48
To a restricted extent.
(physics) A naturally-occurring radioactive isotope of calcium, ⁴⁸₂₀Ca, having twenty protons and twenty-eight neutrons, and a half-life of 4.3x10¹⁹ years
(uncommon) One who studies or is a scholar of Bantu languages or peoples; a Bantuist.
simple past tense and past participle of downrank
ニュートリノなし二重ベータ崩壊を探すために、チームは検出器用に質量数48の天然放射性カルシウム同位体（陽子20、中性子28、半減期は4.3×10^19年）の試料を濃縮した。
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