unit:BQ-PER-KiloGM
The only unit in the category of Specific radioactivity. It is also known as becquerels per kilogram, becquerel/kilogram. This unit is commonly used in the SI unit system. Becquerel Per Kilogram (Bq/kg) has a dimension of $M{-1}T{-1}$ where $M$ is mass, and $T$ is time. It essentially the same as the corresponding standard SI unit $/kg/s$.