[wil-helm kon-rad;; German vil-helm kawn-raht] /ˈwɪl hɛlm ˈkɒn ræd;; German ˈvɪl hɛlm ˈkɔn rɑt/ (Show IPA), 1845–1923, German physicist: discoverer of x-rays 1895; Nobel prize 1901.
(lowercase) Physics. a unit of exposure dose that measures x-rays or gamma rays in terms of the ions or electrons produced in dry air at 0° C and one atmosphere, equal to the amount of radiation producing one electrostatic unit of positive or negative charge per cubic centimeter of air.
Abbreviation: r, R.
(sometimes lowercase) of or relating to Wilhelm Roentgen, the Roentgen unit, or especially to x-rays.
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 air of mass one kilogram are stopped completely R, r
Wilhelm Konrad (ˈvɪlhɛlm ˈkɔnraːt). 1845–1923, German physicist, who in 1895 discovered X-rays: Nobel prize for physics 1901
roentgen roent·gen or rönt·gen (rěnt’gən, -jən, rŭnt’-)
Abbr. R, r
A unit of radiation exposure that is 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 Roent·gen (rěnt’gən, -jən, rŭnt’-) or Rönt·gen (rɶnt’gən), Wilhelm Konrad. 1845-1923.
German physicist who discovered x-rays and developed x-ray photography, revolutionizing medical diagnosis. He won a 1901 Nobel Prize.
German physicist who discovered x-rays in 1895 and went on to develop x-ray photography, which revolutionized medical diagnosis. In 1901 he was awarded the Nobel Prize for physics.
- Roentgen equivalent man
noun 1. the dose of ionizing radiation that produces the same effect in man as one roentgen of x- or gamma-radiation REM, rem
roentgenism roent·ge·nism (rěnt’gə-nĭz’əm, -jə-, rŭnt’-) n. The use of x-rays in the diagnosis and treatment of disease. A damaging effect of x-rays on tissues.
noun, Chemistry, Physics. 1. a superheavy, synthetic radioactive element with a very short half-life. Symbol: Rg; atomic number: 111.
verb (used with object), roentgenized, roentgenizing. (formerly) 1. to subject to the action of x-rays. verb 1. (transitive) to bombard with X-rays