…In 1899, André Debierne of France discovered a new radioactive element in the residues 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. Only 227 Ac (actinium series) and 228 Ac (β decay, half-life 6.13 hours, thorium series) exist in nature, but both are in extremely small amounts and are not extracted in amounts that can be handled normally. … *Some of the terminology explanations that mention "Emanium" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…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。天然には227Ac(アクチニウム系列)および228Ac(β崩壊,半減期6.13時間,トリウム系列)のみが存在するが,いずれもきわめて微量で,普通に取り扱えるほどの量はとり出されていない。… ※「エマニウム」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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