英语词汇“radioactinium”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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radioactinium

radioactinium n.

Brit.

/ˌreɪdɪəʊakˈtɪnɪəm/

U.S.

/ˌreɪdioʊˌækˈtɪniəm/

now chiefly historical an isotope of thorium (thorium-227) which is produced by beta decay of actinium and itself decays by alpha emission with a half-life of 18.7 days.

ΘΚΠ

the world > matter > physics > atomic nucleus > radioactive isotope > specific isotopes > [noun] > thorium

radioactinium1906

ionium1907

1906 O. Hahn in Nature 12 Apr. 560/1 I have found that a new product is present in actinium which is intermediate between actinium and actinium X, and..will be called..‘radio-actinium’.

1926 R. W. Lawson tr. G. von Hevesy & F. A. Paneth Man. Radioactivity xxiii. 164 The β-radiation of actinium, the existence of which it is necessary to assume in order to explain its transformation into radioactinium, is too weak to be detected.

1989 R. Pflaum Grand Obsession xvi. 274 Marie got up before daybreak to prepare personally the source of radioactinium he needed.

extracted from radio-comb. form²

as lemmas

单词	radioactinium
释义	> as lemmas radioactinium radioactinium n. Brit. /ˌreɪdɪəʊakˈtɪnɪəm/ , U.S. /ˌreɪdioʊˌækˈtɪniəm/ now chiefly historical an isotope of thorium (thorium-227) which is produced by beta decay of actinium and itself decays by alpha emission with a half-life of 18.7 days. ΘΚΠ the world > matter > physics > atomic nucleus > radioactive isotope > specific isotopes > [noun] > thorium radioactinium1906 ionium1907 1906 O. Hahn in Nature 12 Apr. 560/1 I have found that a new product is present in actinium which is intermediate between actinium and actinium X, and..will be called..‘radio-actinium’. 1926 R. W. Lawson tr. G. von Hevesy & F. A. Paneth Man. Radioactivity xxiii. 164 The β-radiation of actinium, the existence of which it is necessary to assume in order to explain its transformation into radioactinium, is too weak to be detected. 1989 R. Pflaum Grand Obsession xvi. 274 Marie got up before daybreak to prepare personally the source of radioactinium he needed. extracted from radio-comb. form² < as lemmas
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