roentgen


roentgen
   or röntgen
(R)
   a non-metric unit used to measure the ionizing ability of radiation. Radiation often ionizes atoms it strikes, stripping one or more electrons from them. The biological effects of radiation are caused in large part by excessive ionization within living cells, so it is important to measure this ionizing ability of radiation. For x-rays and gamma rays, this is often done by measuring the electric charge released when air is ionized by the radiation. The roentgen is an old unit used for this purpose; one roentgen equals a charge release rate of 258 microcoulombs per kilogram of air. The unit is named for one of the early investigators of radioactivity, the German physicist Wilhelm Konrad Röntgen (1845-1923). In English it is usually pronounced "rent-gen" with a hard g sound; sometimes the soft g ("rent-jen") is used.

Dictionary of units of measurement. 2015.

Look at other dictionaries:

  • Roentgen — (Wilhelm Conrad). V. Röntgen. Roentgen n. m., roentgenthérapie n. f. V. röntgen, röntgenthérapie. ⇒ROENTGEN, RÖNTGEN, subst. masc. PHYS. Unité de quantité de radiation (X ou ) produisant dans l air des ions porteurs d une quantité d électricité… …   Encyclopédie Universelle

  • roentgen — (Wilhelm Conrad). V. Röntgen. Roentgen n. m., roentgenthérapie n. f. V. röntgen, röntgenthérapie. ⇒ROENTGEN, RÖNTGEN, subst. masc. PHYS. Unité de quantité de radiation (X ou ) produisant dans l air des ions porteurs d une quantité d électricité… …   Encyclopédie Universelle

  • ROENTGEN (D.) — ROENTGEN DAVID (1743 1807) Fils d’Abraham Roentgen (1711 1792), ébéniste allemand installé à Neuwied près de Coblence. Formé par son père, David Roentgen lui succède en 1772. Il donne une grande extension à l’atelier de Neuwied, dont la… …   Encyclopédie Universelle

  • Roentgen — Saltar a navegación, búsqueda Röntgen o Roentgen puede referirse a: Wilhelm Conrad Röntgen, físico alemán. Abraham Röntgen y David Röntgen, ebanistas alemanes. Julius Röntgen, compositor alemán. Röntgen, unidad de medida para la radiación… …   Wikipedia Español

  • roentgen — RÓENTGEN s.m. v. röntgen. Trimis de cornel, 13.09.2007. Sursa: DEX 98  ROENTGEN [pr.: röntghén] roentgeni m. fiz. Unitate de măsură pentru radiaţii. ♢ Aparat roentgen aparat folosit în medicină pentru efectuarea roentgenoscopiei. [var. röntgen]… …   Dicționar Român

  • Roentgen —   [ rœ ], David, Kunsttischler, * Herrnhaag (heute zu Büdingen) 11. 8. 1743, ✝ Wiesbaden 12. 2. 1807; entwickelte die 1772 übernommene Werkstatt seines Vaters Abraham (* 1711, ✝ 1793) in Neuwied zu einem Unternehmen von internationalem Ruf. Seit… …   Universal-Lexikon

  • roentgen — (R) Cantidad de radiación X o gamma que crea una unidad electrostática de iones en 1 ml de aire a 0 ºC y 760 mm de presión. En radioterapia o radiodiagnóstico, el roentgen es la unidad de la dosis emitida …   Diccionario médico

  • roentgen — 1896, in Roentgen rays X rays, in recognition of German physicist Wilhem Conrad Röntgen (1845 1923), who discovered X rays in 1895. As a unit of exposure to radiation, it is attested from 1922, proposed in French in 1921 …   Etymology dictionary

  • roentgen — (De W. C. von Roentgen, 1845 1923, físico alemán descubridor de los rayos X). m. Fís. y Med. Unidad electrostática cegesimal de poder ionizante con relación al aire. Se emplea en las aplicaciones terapéuticas de los rayos X …   Diccionario de la lengua española

  • roentgen — [rent′gən, ren′chən] n. [after ROENTGEN Wilhelm Konrad] a basic unit of exposure to X rays, gamma rays, or other ionizing radiation, equal to the amount of radiation that will produce an electric charge of 0.000258 coulomb per kilogram of dry air …   English World dictionary

  • Roentgen — Roentgen. См. рентген. (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.


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