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Specific absorption rate (SAR) is a measure of the rate at which energy is absorbed per unit mass by a human body when exposed to a radio frequency (RF) electromagnetic field. It is defined as the power absorbed per mass of tissue and has units of watts per kilogram (W/kg).[1]
SAR is usually averaged either over the whole body, or over a small sample volume (typically 1 g or 10 g of tissue). The value cited is then the maximum level measured in the body part studied over the stated volume or mass.
^Jin, Jianming (1998). Electromagnetic Analysis and Design in Magnetic Resonance Imaging. CRC Press. pp. §5.3.3 pp. 226ff. ISBN 978-0-8493-9693-9.
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