# sievert (Sv)

The sievert (Sv) is the derived unit of equivalent
dose of ionizing radiation in the SI system of units, equal to one joule per kilogram (1Jkg^{-1}).
One sievert is the absorbed dose of radiation that produces the same biological
effect as 1 gray of X-rays or gamma rays. One sievert is equal to
100 rems. It is named after the Swedish
physicist Rolf Sievert (1896–1966).