…Many isotopes are known, but the longest half-life is 227 Ac (21.6 years). In 1899, André Debierne of France discovered a new radioactive element in the residue of uranium separation from pitchblende, and named it after the Greek word aktinos or aktis, meaning "light" or "radiation." In 1902, Friedrich Oskar Giesel of Germany independently discovered emanium, which was later found to be the same as actinium. … *Some of the terminology that mentions "Debierne, A." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…多くの同位体が知られているが,半減期の最も長いものは227Ac(21.6年)。1899年,フランスのドビエルヌAndré Debierneは,ピッチブレンドからウランを分離した残留物中に新しい放射性元素を発見し,〈光〉〈放射線〉を意味するギリシア語のaktinosまたはaktisにちなんで命名した。また1902年ドイツのギーゼルFriedrich Oskar Gieselが独立に発見したエマニウムemaniumは,のちにアクチニウムと同じものであることがわかった。… ※「Debierne,A.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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