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RERF Glossary

Gray (Gy)

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.