strontium 90

strontium 90
strontium 90 n a heavy radioactive isotope of strontium having the mass number 90 that is present in the fallout from nuclear explosions and is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals called also radiostrontium

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a radioactive isotope of strontium, atomic mass 90, having a half-life of 28.5 years; it decays by emission of beta particles and forms yttrium 90 (q.v.) as a daughter product. It is used as a source of beta radiation in the treatment of a variety of benign ophthalmologic conditions.

Medical dictionary. 2011.

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  • Strontium — (pronEng|ˈstrɒntiəm, ) is a chemical element with the symbol Sr and the atomic number 38. An alkaline earth metal, strontium is a soft silver white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when… …   Wikipedia

  • Strontium — Rubidium ← Strontium → Yttrium Ca …   Wikipédia en Français

  • STRONTIUM — De Strontian, ville d’Écosse. Symbole chimique: Sr Numéro atomique: 38 Masse atomique: 87,62 Point de fusion: 769 0C Point d’ébullition: 1 384 0C Densité (à 20 0C): 2,54 Métal alcalinoterreux mou, de reflet argenté quand il est fraîchement coupé …   Encyclopédie Universelle

  • Strontium 90 — may refer to: *Strontium 90, a Strontium isotope *Strontium 90 (band) was a British band …   Wikipedia

  • Strontium-90 — A radioactive isotope of strontium produced by certain nuclear reactions, and constituting one of the prominent harmful components of radioactive fallout from nuclear explosions; also called {radiostrontium}. It has a half life of 28 years. [1913 …   The Collaborative International Dictionary of English

  • strontium — [strän′shəm, strän′shē əm; stränt′ē əm] n. [ModL: so named (1808) by DAVY Sir Humphry, who first isolated it < STRONTIA + IUM] a pale yellow, metallic chemical element, one of the alkaline earth metals, resembling calcium in properties and… …   English World dictionary

  • strontium — light metallic element, 1808, coined in Modern Latin by English chemist Sir Humphry Davy (1778 1829) from Strontian, name of a parish in Argyllshire, Scotland, the site of lead mines where strontium was first found …   Etymology dictionary

  • Strontium — Stron ti*um, n. [NL. See {Strontia}.] (Chem.) A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than… …   The Collaborative International Dictionary of English

  • strontium 90 — strontium 90. См. стронций 90. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Strontĭum — Strontĭum, Element, zu den Metallen der alkalischen Erden gehörig; chemisches Zeichen Sr, Atomgewicht 43,84 (H = 1) od. 548 (O = 100). Findet sich in der Natur als Oxyd (Strontian) an Schwefelsäure od. Kohlensäure gebunden; der schwefelsaure… …   Pierer's Universal-Lexikon

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