A radioactive element formed as a gas during the breakdown of radium.
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A gaseous radioactive element, atomic no. 86, resulting from the breakdown of radium; of the isotopes with mass numbers between 198 and 228, only 222Rn is medically significant as an alpha-emitter, with a half-life of 3.8235 days; it is used in the treatment of certain malignancies. Poorly ventilated homes in some parts of the country accumulate a dangerous amount of naturally occurring r. gas. [from radium]

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ra·don 'rā-dän n a heavy radioactive gaseous element of the group of inert gases formed by disintegration of radium and used similarly to radium in medicine symbol Rn called also radium emanation see ELEMENT (table)

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a radioactive gaseous element that is produced during the decay of radium. Sealed in small capsules called radon seeds, it is used in radiotherapy for the treatment of cancer, but has largely been replaced by newer agents and techniques. It emits alpha and gamma radiation. Symbol: Rn.

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ra·don (Rn) (raґdon) a heavy, colorless, gaseous, radioactive element; atomic weight, 222; atomic number, 86; obtained by the breaking up of radium, and used in radiotherapy. 219Rn is a radioactive isotope of the actinium radioactive series. 220Rn is a radioactive isotope of the thorium radioactive series.

Medical dictionary. 2011.

Look at other dictionaries:

  • radon — radon …   Dictionnaire des rimes

  • Radón — Saltar a navegación, búsqueda Astato Radón Francio Xe Rn Uuo       Tabla completa …   Wikipedia Español

  • radon — RADÓN s.n. Element chimic gazos cu proprietăţi radioactive, format prin dezintegrarea radiului. – Din fr. radon. Trimis de LauraGellner, 02.07.2004. Sursa: DEX 98  RADÓN s. (chim., fiz.) emanaţie de radiu. (radon este un element chimic… …   Dicționar Român

  • RADON (J.) — RADON JOHANN (1887 1956) Pensée abstraite et pouvoir d’adaptation fondé sur l’intuition géométrique, tel est le double talent mathématique de l’Autrichien Johann Radon, qui est aussi bien capable de créer une théorie générale ou de traiter un… …   Encyclopédie Universelle

  • radon — [ radɔ̃ ] n. m. • 1923; de radium ♦ Phys. Élément radioactif naturel (Rn; no at. 86), gaz rare produit par la désagrégation des isotopes du radium. ● radon nom masculin Élément radioactif de masse atomique 222, de numéro atomique 86. (C est le… …   Encyclopédie Universelle

  • Radon — Ra don (r[=a] d[o^]n), n. (Chem.) An intensely radioactive gaseous element produced by the radioactive decay of radium 226, which is the main isotope of radium found in pitchblende. Chemically it is an inert noble gas. Its atomic symbol is Rn. It …   The Collaborative International Dictionary of English

  • radón — elemento radioactivo gaseoso generado por la desintegración del radio Diccionario ilustrado de Términos Médicos.. Alvaro Galiano. 2010. radón (Rn) Elemento no metálico, radiactivo, inerte …   Diccionario médico

  • radon — Symbol: Rn Atomic number: 86 Atomic weight: (222) Colorless radioactive gaseous element, belongs to the noble gases. Of the twenty known isotopes, the most stable is Rn 222 with a half life of 3.8 days. Formed by the radioactive decay of Radium… …   Elements of periodic system

  • Radon — er et grundstof. Radon findes i alle radioaktive mineraler …   Danske encyklopædi

  • rádon — s. m. [Química] Elemento químico gasoso radioativo (símbolo Rn), de número atômico 86. = RADÃO • [Brasil] Plural: rádones ou rádons. • [Portugal] Plural: rádones.   ‣ Etimologia: francês radon …   Dicionário da Língua Portuguesa

  • Radon — См. Радон Термины атомной энергетики. Концерн Росэнергоатом, 2010 …   Термины атомной энергетики

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