roentgen(redirected from roentgen unit)
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roent·genalso rönt·gen (rĕnt′gən, -jən, rŭnt′-)
n. Abbr. R or r
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.
[After Wilhelm Conrad Roentgen.]
(Biography) Wilhelm Konrad (ˈvɪlhɛlm ˈkɔnraːt). 1845–1923, German physicist, who in 1895 discovered X-rays: Nobel prize for physics 1901
roentgen(ˈrɒntɡən; -tjən; ˈrɛnt-) or
(Units) 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. Symbol: R or r
[C20: named after W. K. Roentgen]
or Rönt•gen(ˈrɛnt gən, -dʒən, ˈrʌnt-)
1. Wilhelm Konrad, 1845–1923, German physicist.
A unit of exposure dose of gamma (or X-) radiation. In field dosimetry, one roentgen is essentially equal to one rad.
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|Noun||1.||roentgen - a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air|
radioactivity unit - a measure of radioactivity
|2.||Roentgen - German physicist who discovered x-rays and developed roentgenography (1845-1923)|