Of or pertaining to the German physicist Wilhelm Konrad Röntgen, or the rays discovered by him; as, Röntgen apparatus.
A measure of the ability of x-rays or radioactive decay products to produce ionization in air. One roentgen corresponds to the absorption of about 86 ergs (100 ergs = 6.24 x 10 million electron volts, MeV) of energy from x- or gamma radiation, per gram of air. The corresponding absorption of energy in tissue may be from one-half to two times as great, depending on the energy and type of the radiation and the chemical composition of the tissue.
A unit of radiation exposure to product in air 2.58 X 10-4 coulomb of ions per kilogram of air.
A unit of gamma radiation measured by the amount of ionization in air. In non-bony biological tissue 1 roentgen delivers a dose approximately equal to 1 rad. solubility: The ability to dissolve in water. For instance, the less soluble a given amount of material, the more difficult it is for the body to remove it. An insoluble material inhaled into the lungs for example would have more time to do damage to the lungs.
The amount of radiation that will produce one electrostatic unit of ions per cubic centimeter volume.
unit of X or gamma radiation dosage: The amount of such radiation sufficient to produce ions carrying 1 electrostatic unit of charge in I ~11733 of air.
The basic unit of gamma ray exposure. One roentgen is the exposure resulting from the generation of one electrostatic unit (esu) of charge per 0.001293 g (1 cm at STP) of dry air. A fixed exposure rate exists at every point in space surrounding a source of fixed intensity.
A unit of exposure to gamma (or X) radiation. It is defined precisely as the quantity of gamma (or X) rays that will produce electrons (in ion pairs) with a total charge of 2.58 x 10-4 coulomb in 1 kilogram of dry air. An exposure of 1 roentgen results in the deposition of about 94 ergs of energy in 1 gram of soft body tissue. Hence, an exposure of 1 roentgen is approximately equivalent to an absorbed dose of 1 rad in soft tissue. See; Radiation.
internation LETTER of radiation; a standard quantity of X or gamma radiation
The Roentgen, the international unit of X radiation or gamma radiation, is the amount of radiation producing, under ideal conditions in one cc ionization of either sign equal to one electrostatic unit of charge.
See Units of radiation.
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
German physicist who discovered x-rays and developed roentgenography (1845-1923)
an international unit of exposure dose of gamma (or x-) radiation
a unit of radioactive measurment for X-Rays, designated by a captial R
a unit of exposure to x-rays or gamma rays. One roentgen is the amount of gamma or x-rays needed to produce ions carrying 1 electrostatic unit of electrical charge in 1 cubic centimeter of dry air under standard conditions.
A unit of exposure of x or gamma radiation based on the ionization that these radiations produce in air. An exposure of one roentgen results in 2.584 X 1O-4 coulomb per kilogram of air.
The roentgen is a unit used to measure a quantity called exposure. This can only be used to describe an amount of gamma and X-rays, and only in air.
A unit of exposure to ionizing radiation. It is the amount of gamma or X-rays required to produce ions carrying one electrostatic unit of electrical charge in one cubic centimeter of dry air under standards conditions. Named after Wilhelm Roentgen, German scientist who discovered X-ray in 1895.
The unit of radiation exposure in air equal to 2.58E-4 coulombs/kilogram.
the quantity of x or gamma radiation producing 2.58 x 10-4 coulombs per kilogram of dry air; equivalent to 1 esu in 1 cc of air.
the quantity of x or gamma radiation such that the associated corpuscular emission per 0.001293 gram of dry air produces, in air, ions carrying one electrostatic unit of quantity of electricity of either sign. Amount of energy is equal to 2.58 x 10-4 coulombs/kg air. The Roentgen is a special unit of exposure.
A unit of exposure to ionizing radiation. It is that amount of gamma or x-rays required to produce ions carrying 1 electrostatic unit of electrical charge in 1 cubic centimeter of dry air under standard conditions. Named after Wilhelm Roentgen, German scientist who discovered x-rays in 1895. Split Sample A sample from one location that is divided into two samples and analyzed by different laboratories.
the amount of x or gamma radiation which will cause ionization of one electrostatic unit of charge in 1 cubic centimeter of dry air at standard temperature and pressure.
(symbol: r) Obsolete unit of ionizing radiation. The SI unit is the sievert (symbol: Sv; 1 Sv » 8.4 r)
(R) A unit used to measure the quantity of exposure to gamma radiation and x-rays in the air.
The unit of exposure from X or gamma rays (see exposure).
The amount of ionization in air caused by X and gamma radiation. One roentgen of exposure will produce about 2 billion ion pairs per cubic centimeter of air. A roentgen is only a measure of the ionization that radiation produces in air. It does not provide exact information about the amount of energy that is actually absorbed by a medium, or about the effects of the radiation on the medium.
a unit that measures the amount of ionizing radiation given off by a substance. Safegaurd-the only missile defense system ever deployed by the U.S. Salvage fusing-causes a nuclear weapon to blow up if it is intercepted by enemy defenses. Sanctuary-a region (such as the homelands of the superpowers) that would be unaffected by a limited nuclear war.
A unit of exposure to radiation like X-rays.
The unit for exposure. It is equal to the amount of gamma or x-rays required to produce ions carrying 1 electrostatic unit of electrical charge in 1 cubic centimeter of dry air under standard conditions.
A basic unit of measurement of the ionization produced in air by gamma or x-rays. One Roentgen (R) is exposure to gamma or x-rays that will produce one electrostatic unit of charge in one cubic centimeter of dry air. One thousand milliroentgen (1,000 mR)= 1R.