…unit of gamma-ray exposure, the roentgen (R), is defined in terms of the amount of ionization charge created per unit mass of air. The roentgen is a legacy unit of measurement for the kerma of X-rays and gamma rays up to 3 MeV. What does roentgen ray mean? 2. Roentgen ray in American English. The ionizing electromagnetic radiation emitted from a highly evacuated tube, resulting from the excitation of the inner orbital electrons by the bombardment of the target anode with a stream of electrons from a heated cathode. Roentgen ray: Term coined around 1890 that preceded X-ray and is now synonymous with it. x-ray (eks'rā), 1. (sometimes lc) x-ray. Test Your Knowledge - and learn some interesting things along the way. The ionizing electromagnetic radiation emitted from a highly evacuated tube, resulting from the excitation of the inner orbital electrons by the bombardment of the target anode with a stream of electrons from a heated cathode. noun. Most material © 2005, 1997, 1991 by Penguin Random House LLC. roentgen ray - electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target X ray , X-radiation , X-ray ionizing radiation - high-energy radiation capable of producing ionization in substances through which it passes 1. a. Medical Definition of roentgen (Entry 2 of 2), Britannica.com: Encyclopedia article about roentgen. “Roentgen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/roentgen. What made you want to look up roentgen? All Free. He's making a quiz, and checking it twice... Test your knowledge of the words of the year. ARRS: American Roentgen Ray Society, 44211 SlatestoneCourt, Leesburg, VA 20176-5109, phone: (703) 729-3353 or(800) 438-2777, website: www.arrs.org.. 1. The roentgen has its roots in the Villard unit defined in 1908 by the American Roentgen Ray Society as "the quantity of radiation which liberates by ionisation one esu of electricity per cm of air under normal conditions of temperature and pressure." International Scientific Vocabulary, from Wilhelm Röntgen. Post the Definition of roentgen to Facebook, Share the Definition of roentgen on Twitter. Medical Definition of Roentgen ray. 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 Synonym(s): roentgen ray Compare: glass rays, indirect rays. Rontgen - German physicist who discovered x-rays and developed roentgenography (1845-1923) (Investigational Radar Device), Microwave signals used to detect small breast tumors. https://medical-dictionary.thefreedictionary.com/roentgen+ray, Nandalur presented the study findings in May at the annual meeting of the American, Compared with conventional technology, digital chest radiographs can reduce the amount of radiation patients receive by 66% or more with no reduction in image quality, according to a study presented at the American, Allan Maimed said in a poster session at the annual meeting of the, Allan Malmed said in a poster session at the annual meeting of the, Statler, MC, USA, noted in his presentation at the annual meeting of the American, Muttarak said at the annual meeting of the American, O'Reilly urged at the annual meeting of the American, Andrea Arjonilla said at the annual meeting of the American, WASHINGTON -- Ultrasound assessment correctly classifies more than 90% of palpable breast masses in girls as normal tissue, cysts, abscesses, or solid masses, Kyung-Hwa Rhee reported at the annual meeting of the American, Theodorou said at the annual meeting of the, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Positioning is key to cancer detection. It doesn’t require balancing a ball on your nose. (Investigational Device), Ultrafast CT Scans: Sedation of Young Children Unnecessary, CT findings flag perforation in appendicitis (Retrospective, Case-Control Study), Renal Transplant Recipients on Cyclosporin A Develop Breast Masses, When Mammography Is Equivocal, US Is Critical, VCUG Not Required for Mild Hydronephrosis, Ultrasound Accurately Classifies Breast Masses in Girls, Roentgen Single-plane Stereophotogrammetric Analysis. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. He made this seminal discovery by accident while experimenting with a set of cathode ray instruments. The roentgen equivalent man (or rem) is a CGS unit of equivalent dose, effective dose, and committed dose, which are measures of the health effect of low levels of ionizing radiation on the human body. How to pronounce roentgen. Enrich your vocabulary with the English Definition dictionary A unit of radiation exposure equal to the quantity of ionizing radiation that will produce one electrostatic unit of electricity in one cubic centimeter of dry air at 0°C and standard atmospheric pressure. 'Nip it in the butt' or 'Nip it in the bud'. Enrich your vocabulary with the English Definition dictionary Modified entries © 2019 by Penguin Random House LLC and … 1. Roentgen, Wilhelm: Wilhelm Conrad Rontgen (1845-1923), German-born, Dutch-educated physicist who first observed and documented X-rays on November 8, 1895. Synonym (s): roentgen ray Compare: glass rays, indirect rays. Learn more. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Noun: 1. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. gen (rĕnt'gĕn), Wilhelm K., German physicist and Nobel laureate, 1845-1923. Using 1 esu ≈ 3.33564×10 C and the air density of ~1.293 kg/m³ at 0 °C and 101 kPa, this converts to 2.58 × 10 C/kg, which is the modern value given by NIST. A type of irradiation used for imaging purposes that uses energy beams of very short wavelengths (0.1 to 1000 angstroms) that can penetrate most substances except heavy metals. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. 'All Intensive Purposes' or 'All Intents and Purposes'? : roentgen ray in the most comprehensive dictionary definitions resource on the web cathode rays could substances! 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