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.
roentgen (R)
Roent·gen (r nt g n, -jn, r nt-) or Rönt·gen (r ntgn), Wilhelm Konrad 1845-1923. German physicist who discovered x-rays and developed x-ray photography, revolutionizing medical diagnosis. He won a 1901 Nobel Prize. |
| 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. |
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.
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a superseded international unit of x- or γ-radiation; it is the quantity of x- or γ-radiation such that the associated corpuscular emission per 0.001293 g of air produces,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.
roentgen equivalent man (rem)
see rem.
roentgen equivalent physical (rep)
see rep.
roentgen ray
x-ray.
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