# gray

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## gray

[gra]the SI unit of absorbed radiation dose, defined as the transfer of 1 joule of energy per kilogram of absorbing material (1 J/kg); 1 gray equals 100 rads.

## gray (Gy),

(grā),The SI unit of absorbed dose of ionizing radiation, equivalent to 1 J/kg of tissue; 1 Gy = 100 rad.

Synonym(s): griseus

[Louis H.

*Gray,*British radiologist, 1905-1965]## gray

(gra)**1.**of a hue between white and black.

**2.**a unit of absorbed radiation dose equal to 100 rads. Abbreviated Gy.

## gray (Gy)

the SI unit of absorbed radiation dose. One gray equals the energy equivalent of 1 J/kg of matter; 1 Gy equals 100 rad. See also radiation absorbed dose.

Vox populi adjective Referring to an older person, usually at or near the age of retirement

## gray

Gy Radiation physics The SI unit for radiation, based on actual radiation absorption, as measured by a thermoluminescent dosimeter placed within a Pt or a phantom; 1 Gy is equal to 1 joule/kg of absorber–100 rads## gray

(grā)The SI unit of absorbed dose of ionizing radiation, equivalent to 1 J/kg of tissue; 1 Gy = 100 rad.

[Louis H.

*Gray,*British radiologist, 1905-1965]## gray

A unit of absorbed dose of radiation equal to an energy absorption of 1 Joule per kilogram of irradiated material. 1 Gy is equivalent to 100 RADS. In radiotherapy, radiation is commonly applied to the area of the tumour in a dosage of around 2 Gy a day, five days a week for periods of 3–6 weeks.## gray

**(Gy)**(grā)

The SI unit of absorbed dose of ionizing radiation, equivalent to 1 J/kg of tissue; 1 Gy = 100 rad.

[Louis H.

*Gray,*British radiologist, 1905-1965]## Gray (Gy),

*n*a unit of measurement for an absorbed dose of radiation, from the French

*Systéme International d'Unités;*converts to the traditional rad by the formula 100 rad = 1 Gy.

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