A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 nanometers. 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How to pronounce roentgen. 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. …unit of gamma-ray exposure, the roentgen (R), is defined in terms of the amount of ionization charge created per unit mass of air. Roentgen Rays synonyms, Roentgen Rays pronunciation, Roentgen Rays translation, English dictionary definition of Roentgen Rays. Originating in 1908, this unit has been redefined and renamed over the years. (Research And Technology), Radio waves can flag very small breast tumors. He was surprised to find a flickering image cast by his instruments separated from them by some distance. 2. noun. It is named after the German physicist Wilhelm Röntgen, the man who discovered X-rays. It doesn’t require balancing a ball on your nose. Most material © 2005, 1997, 1991 by Penguin Random House LLC. 1. a. Roentgen definition in English dictionary, Roentgen meaning, synonyms, see also 'roentgen ray',roentgen equivalent man',roentgeno-',roentgenise'. 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 … x-ray (eks'rā), 1. 1. The roentgen is a legacy unit of measurement for the kerma of X-rays and gamma rays up to 3 MeV. Is an X- Ray dangerous to my fetus? Test Your Knowledge - and learn some interesting things along the way. Roentgen ray in American English. Modified entries © 2019 by Penguin Random House LLC and … 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… Post the Definition of roentgen to Facebook, Share the Definition of roentgen on Twitter. Definition of roentgen ray in the Definitions.net dictionary. The unit is still used in the United States Navy nuclear propulsion program. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Roentgenometry definition is - measurement of X rays especially of their dosage for therapeutic purposes. Noun: 1. Named for Wilhelm Roentgen, a German professor of physics. Listen to the audio pronunciation in the Cambridge English Dictionary. Accessed 1 Jan. 2021. noun. According to the currently valid definition, X-rays are emitted by electrons outside the nucleus, while gamma rays are emitted by the nucleus . Meaning 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 The distinction between X-rays and gamma rays is not so simple and has changed in recent decades. ARRS: American Roentgen Ray Society, 44211 SlatestoneCourt, Leesburg, VA 20176-5109, phone: (703) 729-3353 or(800) 438-2777, website: www.arrs.org.. What made you want to look up roentgen? 2. Medical Definition of Roentgen ray. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. or X-ray n. or x ray or X ray 1. a. “Roentgen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/roentgen. Learn a new word every day. I fell down while I am pregnant and was sent to the ER. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Synonym(s): roentgen ray Compare: glass rays, indirect rays. 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.