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gray (Gy)
The derived unit of absorbed dose in the SI system of units. One gray (Gy) dose is equivalent to 1 joule of radiation energy absorbed per kilogram of organ or tissue weight. It is named after the British radiologist L. H. Gray (1905-1965). Rad is the old and still used unit of absorbed dose. 1 Gy = 100 rad.
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• UNITS
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