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 Gray
(Gy)
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A quantity of energy imparted by ionizing radiation to a unit mass of matter.
A gray (abbreviated as Gy) is the amount of energy deposited in tissues;
technically, 1 joule of energy per kilogram of tissue. When ionizing radiation
passes through a body, some of its energy is imparted to the surrounding
tissue. The average cumulative radiation doses from natural, medical, and
occupational sources are estimated to be about 2 milliGy (or 0.002 Gy)
per year for humans.
Also
see sievert. |
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