the SI unit of absorbed dosage of ionizing radiation, equal to an absorbed energy of 1 joule per kilogram of irradiated material; -- abbreviated Gy. This unit is 100 times the commonly used unit, the rad.
Gray (Gy) is the SI derived unit of absorbed dose of radiation. The gray is the absorbed dose when the energy per unit mass imparted to matter by ionizing radiation is one joule per kilogram (Gy = J/kg). The unit is named after the British scientist Louis Harold Gray (1905-1965).
A unit of absorbed radiation dose equal to 100 rads. half-life: The time in which half the atoms of a radioactive substance will have disintegrated, leaving half the original amount. Half of the residue will disintegrate in another equal period of time.
A measure of radiation exposure defined in terms of the total amount of energy absorbed per unit mass of the absorbing material. One gray is equal to 1 joule of energy deposition per kilogram of the target material. Because the amount of energy absorbed depends on the nature of the target material, the unit is often qualified to indicate the nature of the target. One gray is equal to 100 rad.
a unit of measurement for absorbed dose. It measures the amount of energy absorbed in a material. The unit Gy can be used for any type of radiation, but it does not describe the biological effects of the different radiations. For more information, see " Primer on Radiation Measurement" at the end of this document.
Unit that measures the radiation dose (Gy). International health and safety authorities have endorsed the safety of irradiation for all foods up to a dose level of 10,000 Gy (10 kGy). One gray equals one joule of energy absorbed per kilogram of food being irradiated.
A unit of absorbed radiation equal to the dose of one joule of energy absorbed per kilogram of matter, or 100 rad . The unit is named for the British physician L. Harold Gray (1905-1965), an authority on the use of radiation in the treatment of cancer. The abbreviation for a gray is Gy. See also: Milligray . See the entire definition of Gray
The special name for the SI unit of absorbed dose, kerma, and specific energy imparted equal to one joule per kilogram. One gray equals one joule per kilogram. The previous unit of absorbed dose, rad, has been replaced by the gray. 1 Gy = 100 rad.
any color of neutral hue between white and black; white mixed with black, as the color of pepper and salt, or of ashes, or of hair whitened by age; sometimes, a dark mixed color; as, the soft gray eye of a dove.
matter: brain tissue is divided into two types: gray matter and white matter. Gray matter is made up of the cell bodies of nerve cells. The volume of gray matter tissue is a measure of the density of brain cells in a particular region. (for more, see article)
A horse color where the majority of the coat is a mixture of black and white hairs. The mane, tail and legs may be either black or gray unless white markings are present. Starting with foals of 1993, the color classifications gray and roan were combined as "roan or gray." See roan.
Gray is a rather depressing color; some mystics believe it to be the color of the aura of a prison. Some sources believe it to indicate a slow period in the dreamerâ€(tm)s life, when he or she is merely â€œmarking time.
Gray or Grey is a coat color of horses, consisting of black skin, and a hair coat that is white, dappled, or white intermingled with hairs of other colors. Gray horses are usually born bay, chestnut, or black, then white hairs begin to appear at or shortly after birth and "gray out" the horse. Graying can occur at different rates--very quickly on one horse and very slowly on another.
GRAY is a Monte-Carlo ray-driven high energy photon transport engine for mainly PET and SPECT applications that supports complex mesh based primitives for source distributions, phantom shapes, and detector geometries.