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U.S. Department of Health and Human Services

Radiation-Emitting Products

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Air Kerma (Definition)

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Citation: 

900.2(d) Air kerma means kerma in a given mass of air. The unit used to measure the quantity of air kerma is the Gray (Gy). For X-rays with energies less than 300 kiloelectronvolts (keV), 1 Gy = 100 rad. In air, 1 Gy of absorbed dose is delivered by 114 roentgens (R) of exposure.