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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012
Radiation oncology noun The SI unit for radiation, based on actual radiation absorption, as measured by a thermoluminescent dosimeter placed within a patient or a phantom; 1 Gy is equal to 1 joule/kg of absorber, roughly equivalent to 100 rads
Vox populi adjective Referring to an older person, usually at or near the age of retirement
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
men and women as well as amongst smoking and male baldness.2,3 Baldness or hair loss were reported to have a highly significant association with smoking (p-value < 0.0001) in one study while another study also concluded that tobacco smoking has been associated with adverse effects on the skin, which may potentially cause graying of hair.4
A person having premature hair graying or baldness/hair loss have severe complications and effects on the physical appearance, self-esteem, and socio-cultural acceptance of the affected person.6,7 As people mostly view it as a sign of old age and malnourishment, influenced people are frequently subjected to social disgrace, separation, and troubles in marriage.8 Very limited data is available regarding association of smoking or tobacco use with premature graying of hair.
Among the 317 males with gray hair, 172 (54.3%) reported that the onset of gray hair was at less than 30 years of age, 139 (43.8%) had the onset of gray hair at equal or greater than 30 years of age and 6 (1.9%) did not respond to the age at onset of graying of hair.
There are no special diets, nutritional supplements, vitamins, or proteins that have been scientifically proven to halt or slow the graying process.