Ser (unit)

The "Ser" (symbol: Sr) is a unit of measurement used to quantify absorbed dose of radiation in a material. Specifically, 1 Ser is equivalent to an absorbed dose of 1 joule per kilogram (1 J/kg) of radiation energy deposited in a material. The use of the Ser is somewhat historical and has mostly been replaced by the gray (Gy) in modern radiological contexts. The gray is defined in the same way: 1 Gy = 1 J/kg.