Radiation dose - Units

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Radiation dose is quantified using both the conventional units system and the international system of units, or SI.

• “Radiation exposure” is measured in roentgens (R) for conventional units or coulombs per kilogram (C/kg) in SI units.

• “Absorbed dose” is measured in rads (rad) for conventional units or grays (Gy) for SI units.

• “Equivalent dose” is measured in rems in conventional units or sieverts (Sv) for SI units.

• “Effective dose” is measured in effective dose equivalents (Sv—1977 tissue-weighting factors), or sieverts (Sv) for SI units.

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