Sunday, December 27, 2009

Biological effect of Radiation : Absorbed dose

1- Absorbed dose

The amount of energy that ionizing radiation deposits in a unit mass of matter, such as human tissue, is called the, absorbed dose. It is expressed in a unit called the Gray, symbol Gy, where 1 Gy is equal to 1 joule per kilogram. Submultiples of the Gy are often used, such as the milligray, mGy, which is one-thousandth of a Gy. The Gy is named after the English physicist Harold Gray.

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