radiothorium
radiothorium a`di*o*tho"ri*um (r[=a]`d[i^]*[o^]*th[^o]r"[=e]*[u^]m), n. (Chem.) an earlier name for the thorium isotope {thorium-228}, given by its discoverer Otto Hahn. It is a radioactive substance formed as one of series of products in the chain of radioactive decay of thorium. Its immediate predecessor in the chain is Actinium-228, and it decays by alpha emission to radium-224 with a half-life of 1.91 years. The name radiothorium was given prior to the full understanding of the nature of isotopes of elements. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Radiothorium — Radiothorium,   ältere Bezeichnung für das radioaktive Thoriumisotop 228Th (Symbol RdTh), Zwischenglied der Thoriumreihe (Radioaktivität). * * * Ra|dio|tho|ri|um, das: Element aus der radioaktiven Zerfallsreihe des Thoriums …   Universal-Lexikon

  • radiothorium — [rā΄dē ō thôr′ē əm] n. [ModL] a radioactive isotope of thorium, of mass number 228, formed from mesothorium 2 …   English World dictionary

  • Radiothorium — radiotoris statusas T sritis fizika atitikmenys: angl. radiothorium vok. Radiothor, n; Radiothorium, n rus. радиоторий, m pranc. radiothorium, m …   Fizikos terminų žodynas

  • radiothorium — radiotoris statusas T sritis fizika atitikmenys: angl. radiothorium vok. Radiothor, n; Radiothorium, n rus. радиоторий, m pranc. radiothorium, m …   Fizikos terminų žodynas

  • radiothorium — noun radioactive isotope of thorium with mass number 228 • Syn: ↑thorium 228 • Hypernyms: ↑thorium, ↑Th, ↑atomic number 90 * * * |rādē(ˌ)ō+ noun Etymology: New Latin …   Useful english dictionary

  • radiothorium — noun Etymology: New Latin Date: 1905 a radioactive isotope of thorium with the mass number 228 …   New Collegiate Dictionary

  • radiothorium — /ray dee oh thawr ee euhm, thohr /, n. Chem. a disintegration product of thorium. [1920 25; < NL; see RADIO , THORIUM] * * * …   Universalium

  • radiothorium — noun The radioactive isotope thorium 228 …   Wiktionary

  • radiothorium — ra·dio·tho·ri·um thōr ē əm, thȯr n a radioactive isotope of thorium with the mass number 228 …   Medical dictionary

  • Radiothorium — Ra|di|o|tho|ri|um 〈n.; Gen.: s; Pl.: unz.; Chemie; veraltete Bez. für〉 das radioaktiv strahlende Thoriumisotop 228 …   Lexikalische Deutsches Wörterbuch

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