roentgen

roentgen /roent·gen/ (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 dry air produces in air ions carrying 1 electrostatic unit of electrical charge of either sign. Symbol R.

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Roent·gen (rntgn, -jn, rnt-) or Rönt·gen (rntgn), Wilhelm Konrad 1845-1923.

German physicist who discovered x-rays and developed x-ray photography, revolutionizing medical diagnosis. He won a 1901 Nobel Prize.

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roent·gen or rönt·gen (rntgn, -jn, rnt-)

n. 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.

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roentgen (R)

[rent′gən, ren′jən]

Etymology: Wilhelm K. Roentgen, German physicist, 1845-1923

the quantity of x-radiation or gamma radiation that creates 1 electrostatic unit of ions in 1 mL of air at 0° and 760 mm of pressure. In radiotherapy or radiodiagnosis, the roentgen is the unit of the emitted dose. See also radiation absorbed dose, rem.

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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. Abbreviated R.

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roentgen

a superseded international unit of x- or γ-radiation; it is the quantity of x- or γ-radiation such that the associated corpuscular emission per 0.001293 g of air produces,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. Abbreviated R. Now replaced by coulomb/kg (C/kg); see coulomb. 1 R = 2.58 × 10⁻⁴ C/kg; 1 C/kg = 3876 R.

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roentgen equivalent man (rem)

see rem.

roentgen equivalent physical (rep)

see rep.

roentgen ray

x-ray.