Definition of Roentgen

1. Noun. A unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air.

Exact synonyms: R
Generic synonyms: Radioactivity Unit



2. Noun. German physicist who discovered x-rays and developed roentgenography (1845-1923).

Definition of Roentgen

1. a unit of radiation dosage [n -S]

Medical Definition of Roentgen

1. The special unit of exposure, based on a quantity of ionisation (charge) produced by the absorption of X or gamma radiation energy in a specified mass of air under standard conditions. 1R = 2.58 x 10-4 C kg-1 or air. For radiation protection purposes, an exposure to 1 roentgen of x or gamma rays (air kerma of ~10-2 J kg-1) is generally assumed to produce an absorbed dose of 1 rad in water or soft tissue. Abbreviation: R (06 Aug 1998)

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Lexicographical Neighbors of Roentgen

Roderick
Rodger
Rodgers
Rodgerson
Rodhos
Rodin
Rodina
Rodinia
Rodney
Rodney George Laver
Rodolia
Rodolia cardinalis
Rodrigo Borgia
Rodya Raskolnikov
Roebling
Roentgen
Roentgen-ray
Roesler-Bressler infarct
Rog
Rogaine
Rogaland
Rogation Day
Roger
Roger's bruit
Roger's disease
Roger's murmur
Roger's reflex
Roger-Anderson pin fixation appliance
Roger Bacon
Roger Bannister

Literary usage of Roentgen

Below you will find example usage of this term as found in modern and/or classical literature:

1. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1919)
"THIS paper deals with the general constitutional reaction which follows prolonged exposures to the roentgen rays of the Coolidge tube. ..."

2. The Medical Clinics of North America by Richard J. Havel, K. Patrick Ober (1918)
"FREDERICK W. O'BRIEN THE roentgen DIAGNOSIS OF DISEASE OF THE TIPPER RIGHT ABDOMINAL QUADRANT The Anatomy of the Duodenum and Its Relations; Duodenal Ulcer; ..."

3. A Dictionary of Electrical Words, Terms and Phrases by Edwin James Houston (1903)
"roentgen Ether Waves.—A term sometimes employed for Röntgen rays. ... An alternating-current transformer suitable fo» operating a roentgen ray tube. ..."

4. An Introduction to the Theory of Optics by Sir Arthur Schuster (1904)
"roentgen radiation. The radiations which are produced by the impact of kathode rays on solid ... roentgen could find no trace of refraction or polarization, ..."

5. Collected Papers by the Staff of Saint Mary's Hospital, Mayo Clinic by Saint Marys Hospital (Rochester, Minn.) (1917)
"roentgen DIAGNOSIS OF BRONCHIECTASIS * ALEXANDER B. MOORE That the roentgen rays furnish more or less definite information in the diagnosis of ..."

6. Handbook of Therapy by Oliver Thomas Osborne, Morris Fishbein (1918)
"roentgen DERMATITIS The wide use of the roentgen ray in the treatment of various diseases has led to the occurrence of roentgen burns with dermatitis and ..."

7. Handbook of Therapy by Oliver Thomas Osborne, Morris Fishbein (1918)
"roentgen DERMATITIS The wide use of the roentgen ray in the treatment of various diseases has led to the occurrence of roentgen burns with dermatitis and ..."

8. College Physics by John Oren Reed, Karl Eugen Guthe (1911)
"These new rays, to which he gave the name "K-rays, are now generally called roentgen rays, after their discoverer. They are produced when cathode rays are ..."

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