Sievert R.M. Sievert The sievert (Sv) is the unit of effective dose (E) and equivalent dose (H). The unit is named after the Swedish medical physicist Rolf Maximilian Sievert (1896 - 1966). sievert (Sv) = joule (J) / kilogram (kg) The sievert is also used as unit for the derived quantities: ambient dose equivalent committed effective dose committed equivalent dose directional dose equivalent personal dose equivalent