Actinium Emanation

Japanese: アクチニウムエマネーション - あくちにうむえまねーしょん
Actinium Emanation

…A gaseous radioactive nuclide belonging to the actinium series. One of the isotopes of radon, 219 Rn, was once called this (symbol An). It is also called actinium emanation. Also, actinides (14 elements excluding actinium Ac, the 89th element in the actinides) were sometimes called actinons. …

From [Emanation]

...While researching radioactivity, the Curies noticed that the air around radium compounds was radioactive, but E. Rutherford confirmed that this was due to radioactive gases belonging to the rare gases, which he called radium emanation (later, the name radon was given to it because it was produced by the decomposition of radium). In the same way, thorium emanation (thoron) was discovered from thorium, and actinium emanation (actinon) was discovered from actinium, and these were generally collectively called emanation (emanate means to emit) and the symbol was Em, but all of these were unified into radon. [Nakahara Katsunori]...

*Some of the terminology explanations that mention "actinium emanation" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アクチニウム系列に属する気体放射性核種で,ラドンの同位体の一つである219Rnをかつてこのように呼んだ(記号An)。アクチニウムエマネーションactinium emanationともいう。また,アクチニド(アクチノイドから89番のアクチニウムAcを除いた14元素)をアクチノンと呼んだこともある。…

【エマネーション】より

…キュリー夫妻は放射能の研究中,ラジウム化合物の周囲の空気が放射性を示すことに気づいたが,E.ラザフォードはこれが希ガス元素に属する放射性気体によるものであることを確かめ,これをラジウムエマネーションとよんだ(のちに,ラジウムから変脱生成するものだということでラドンの名称が与えられた)。さらに同じようにしてトリウムからトリウムエマネーション(トロン),アクチニウムからアクチニウムエマネーション(アクチノン)も見いだされ,一般にエマネーション(emanateは放射するという意)と総称され,記号もEmとされたが,これらはすべてラドンに統一された。【中原 勝儼】。…

※「アクチニウムエマネーション」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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