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The gray was adopted as part of the International System of Units in 1975. The corresponding cgs unit to the gray is the rad (equivalent to 0.01 Gy), which remains common largely in the United States, though "strongly discouraged" in the style guide for U.S. National Institute of Standards and Technology. [3]
Wilhelm Conrad Röntgen (/ ˈ r ɛ n t ɡ ə n,-dʒ ə n, ˈ r ʌ n t-/; [4] German: [ˈvɪlhɛlm ˈʁœntɡən] ⓘ; anglicized as Roentgen; 27 March 1845 – 10 February 1923) was a German physicist [5] who produced and detected electromagnetic radiation in a wavelength range known as X-rays.
The roentgen or röntgen (/ ˈ r ɛ n t ɡ ə n,-dʒ ə n, ˈ r ʌ n t-/; [2] symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram).
Wilhelm Röntgen: 1845–1923 German Ionizing radiation: röntgen (R) Alexander Graham Bell: 1847–1922 British (Scottish), American Magnitude (log 10, dimensionless) bel (B) Loránd Eötvös: 1848–1919 Hungarian: Gravitational gradient: eotvos (E) Heinrich Kayser: 1853–1940 German Wavenumber: kayser: Joseph John Thomson: 1856–1940 ...
Röntgen or Roentgen may refer to: Roentgen (unit), unit of measurement for ionizing radiation, named after Wilhelm Röntgen; Wilhelm Röntgen (1845–1923), German physicist, discoverer of X-rays; Abraham Roentgen (1711–1793), German cabinetmaker; David Roentgen (1743–1807), German cabinetmaker, son of Abraham Roentgen
Louis Harold Gray FRS (10 November 1905 – 9 July 1965) was an English physicist who worked mainly on the effects of radiation on biological systems. He was one of the earliest contributors of the field of radiobiology . [ 6 ]
The British physicist and radiologist and founder of radiobiology Louis Harold Gray (1905-1965) introduced the unit Rad (acronym for radiation absorbed dose) in the 1930s, which was renamed Gray (Gy) after him in 1978. One gray is a mass-specific quantity and corresponds to the energy of one joule absorbed by one kilogram of body weight. Acute ...
This is a list of scientific units named after people.For other lists of eponyms (names derived from people) see eponym.By convention, the name of the unit is properly written starting with a lowercase letter (except where any word would be capitalized), but the first letter of its symbol is a capital letter if it is derived from a proper name.