"The sievert (symbol Sv) is the SI unit of equivalent dose and effective dose. It is dimensionally equivalent to one joule per kilogram 1."
"Although sievert and gray (Gy) are dimensionally equivalent SI units of dose, they cannot be used interchangeably. Sievert is applicable only in context of radiation safety considerations and estimated stochastic effects of ionising radiation on living tissues. These estimated measures, such as equivalent dose or effective dose, are obtained by adjusting the absorbed dose (expressed in Gy) by radiation weighting factor or tissue weighting factor."
"As per all other eponymous SI units when the unit is written out in full it is not capitalised, but when shortened to its symbol it is capitalised."
"The sievert was adopted as the official SI unit at the 16th General Conference of Weights and Measures (CPGM) in 1979 3."