Roentgen

Roentgen
An international unit of X-radiation or gamma-radiation. (A roentgen is abbreviated R). Named for Wilhelm Roentgen who greatly expanded our diagnostic and treatment capabilities by discovering radiology. A German professor of physics, Roentgen wanted to prove his hypothesis that cathode rays could penetrate substances besides air. When he saw that he could film his thumb and forefinger and their bones on a screen, the story goes that he replaced the screen with a photographic plate and X-rayed his wife's hand. Roentgen's report of his findings, "On a New Kind of Rays," was published by the Physical-Medical Society of Würzburg in December 1895.
* * *
Wilhelm K., German physicist and Nobel laureate, 1845–1923. Discovered x-rays in November, 1895; awarded Nobel Prize in Physics in 1901 for his discovery. See r., r. ray.

* * *

roent·gen also rönt·gen 'rent-gən, 'rənt-, -jən; 'ren-chən, 'rən- adj of, relating to, or using X-rays: x-ray <\roentgen examinations> <\roentgen therapy>
Rönt·gen or Roent·gen 'rœnt-gən Wilhelm Conrad (1845-1923)
German physicist. Röntgen is famous for his discovery of X-rays in 1895. He made the discovery while experimenting with electric current flow in a cathode-ray tube. He observed that a nearby piece of the platinocyanide of barium gave off light when the tube was in operation. He attributed the fluorescence of the chemical to some unknown form of radiation. Because of the uncertain nature of the radiation he called the phenomenon X radiation. For his discovery of X-rays he was awarded the Nobel Prize for Physics in 1901. His discovery had a great impact on both physics and medicine.
roentgen also röntgen n the international unit of x-radiation or gamma radiation equal to the amount of radiation that produces in one cubic centimeter of dry air at 0°C (32°F) and standard atmospheric pressure ionization of either sign equal to one electrostatic unit of charge

* * *

n.
a unit of exposure dose of X- or gamma-radiation equal to the dose that will produce 2.58 x 10-4 coulomb on all the ions of one sign, when all the electrons released in a volume of air of mass 1 kilogram are completely stopped.

* * *

Roent·gen (rentґgən) see Rцntgen.

Medical dictionary. 2011.

Игры ⚽ Нужен реферат?

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.

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”