A unit of radiation used to measure the exposure of someone or something to X-rays or gamma rays.
A unit of measure; the amount of radiation that produces one electrostatic unit of electricity in 1 cubic centimeter of air.
A unit of exposure dose of X- or gamma-radiation equal to the dose that will produce 2.58 x 10⁻⁴ coulomb on all the ions of one sign, when all the electrons released in a volume of air of mass 1 kilogram are completely stopped.
A unit for describing the exposure dose of x-rays or gamma rays. One unit can liberate enough electrons and positrons to produce emissions of either charge of one electrostatic unit of electricity per 0.001293 g of air (the weight of 1 cm3 of dry air at 0°C and at 760 mm Hg).
The roentgen is the unit of measurement for the quantity of X or gamma radiation. It serves as the international unit for the exposure dose of x-rays and gamma rays. A roentgen of radiation is defined as the amount that can ionize dry air to produce one electrostatic unit of electricity per 0.001293 gram of air.