roentgen [rent´gen] the international unit of x- or γ-radiation; it is the quantity of x- or γ-radiation such that the associated corpuscular emission per 0.001293 g of air produces, in air, ions carrying 1 electrostatic unit of electrical charge of either sign. The unit is still used in the United States Navy nuclear propulsion program. 1. noun. He was surprised to find a flickering image cast by his instruments separated from them by some distance. Originating in 1908, this unit has been redefined and renamed over the years. 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. Because of the close connection of the signal produced in an ion chamber with this definition, a measurement of the ion current under proper conditions can give… According to the currently valid definition, X-rays are emitted by electrons outside the nucleus, while gamma rays are emitted by the nucleus . Roentgen Rays synonyms, Roentgen Rays pronunciation, Roentgen Rays translation, English dictionary definition of Roentgen Rays. (Investigational Radar Device), Microwave signals used to detect small breast tumors. b. often x-rays or X-rays A narrow beam of such photons. There will be an annual research award – Roentgen Resident/Fellow Research Award. Roentgen, Wilhelm: Wilhelm Conrad Rontgen (1845-1923), German-born, Dutch-educated physicist who first observed and documented X-rays on November 8, 1895. He's making a quiz, and checking it twice... Test your knowledge of the words of the year. Roentgen wanted to prove his hypothesis that cathode rays could penetrate substances besides air. How to pronounce roentgen. 1. 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 In honour of his accomplishments, in 2004 the International Union of Pure and Applied Chemistry (IUPAC) named element 111, roentgenium, a radioactive element with multiple unstable isotopes, after him. Enrich your vocabulary with the English Definition dictionary I was given an x- ray there, is the radiation dangerous to my fetus? Roentgen definition in English dictionary, Roentgen meaning, synonyms, see also 'roentgen ray',roentgen equivalent man',roentgeno-',roentgenise'. Medical Definition of roentgen (Entry 2 of 2), Britannica.com: Encyclopedia article about roentgen. …unit of gamma-ray exposure, the roentgen (R), is defined in terms of the amount of ionization charge created per unit mass of air. (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. 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." Roentgen ray: Term coined around 1890 that preceded X-ray and is now synonymous with it. 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 … Named for Wilhelm Roentgen, a German professor of physics.Roentgen wanted to prove his hypothesis that cathode rays could penetrate substances besides air. Noun: 1. It doesn’t require balancing a ball on your nose. gen (rĕnt'gĕn), Wilhelm K., German physicist and Nobel laureate, 1845-1923. Synonym (s): roentgen ray Compare: glass rays, indirect rays. He made this seminal discovery by accident while experimenting with a set of cathode ray instruments. 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. [After Wilhelm Conrad Roentgen.] The roentgen is a legacy unit of measurement for the kerma of X-rays and gamma rays up to 3 MeV. What made you want to look up roentgen? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! a unit of dose of electromagnetic radiation equal to the dose that will produce in air a charge of 0.258 × 10 –3 coulomb on all ions of one sign, when all the electrons of both signs liberated in a volume of … x-ray (eks'rā), 1. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 nanometers. 'Nip it in the butt' or 'Nip it in the bud'. 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 The distinction between X-rays and gamma rays is not so simple and has changed in recent decades. Delivered to your inbox! Can you spell these 10 commonly misspelled words? Definition of roentgen ray in the Definitions.net dictionary. Listen to the audio pronunciation in the Cambridge English Dictionary. Information and translations of roentgen ray in the most comprehensive dictionary definitions resource on the web. 2. 'All Intensive Purposes' or 'All Intents and Purposes'? Rontgen - German physicist who discovered x-rays and developed roentgenography (1845-1923) Roentgenometry definition is - measurement of X rays especially of their dosage for therapeutic purposes. or X-ray n. or x ray or X ray 1. a. Synonym(s): roentgen ray Compare: glass rays, indirect rays. “Roentgen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/roentgen. Enrich your vocabulary with the English Definition dictionary 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. What does roentgen ray mean? ARRS: American Roentgen Ray Society, 44211 SlatestoneCourt, Leesburg, VA 20176-5109, phone: (703) 729-3353 or(800) 438-2777, website: www.arrs.org.. Meaning of roentgen ray. 2. Learn more. Q. : 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 and standard atmospheric pressure ionization of … Most material © 2005, 1997, 1991 by Penguin Random House LLC. Learn a new word every day. (Research And Technology), Radio waves can flag very small breast tumors. 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. Roentgen, Wilhelm: Wilhelm Conrad Rontgen (1845-1923), German-born, Dutch-educated physicist who first observed and documented X-rays on November 8, 1895. 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. (sometimes lc) x-ray. Please tell us where you read or heard it (including the quote, if possible). How to say roentgen. Test Your Knowledge - and learn some interesting things along the way. Post the Definition of roentgen to Facebook, Share the Definition of roentgen on Twitter. Roentgen ray: Term coined around 1890 that preceded X-ray and is now synonymous with it. roentgen ray A stream of such photons used for their penetrating power in radiography, radiology, … He made this seminal discovery by accident while experimenting with a set of cathode ray instruments. I fell down while I am pregnant and was sent to the ER. 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. It is named after the German physicist Wilhelm Röntgen, the man who discovered X-rays. Named for Wilhelm Roentgen, a German professor of physics. Roentgen - WordReference English dictionary, questions, discussion and forums. Is an X- Ray dangerous to my fetus? International Scientific Vocabulary, from Wilhelm Röntgen. roentgen ray definition in English dictionary, roentgen ray meaning, synonyms, see also 'Roentgen',roentgen equivalent man',roentgeno-',roentgenise'. 1. a. A photon of electromagnetic radiation of very short wavelength, ranging from about 10 down to 0.01 nanometers, and very high energy, ranging from about 100 up to 100,000 electron volts. roentgen. All Free. Accessed 1 Jan. 2021. Medical Definition of Roentgen ray. 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. Modified entries © 2019 by Penguin Random House LLC and … Roentgenogram, also called roentgenograph or X-ray image, photograph of internal structures that is made by passing X-rays through the body to produce a shadow image on specially sensitized film. Wilhelm Conrad Röntgen was a German mechanical engineer and physicist, who, on 8 November 1895, produced and detected electromagnetic radiation in a wavelength range known as X-rays or Röntgen rays, an achievement that earned him the first Nobel Prize in Physics in 1901. 1 : any of the electromagnetic radiations that have an extremely short wavelength of less than 100 angstroms and have the properties of penetrating various thicknesses of all solids, of producing … Roentgen ray in American English. 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. 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