System International (SI) Units for Ionizing Radiation

Quantity Unit Name
(Symbol)
Definition Former
Unit
Conversion Factor
Activity Becqueral (Bq) Disintegrations/sec Curie (Ci) 1 Bq = 2.7 x 10-11 Ci
Absorbed Dose Gray (Gy) Joule/kilogram rad 1 Gy = 100 rads
Dose Equivalent Sievert (Sv) Joule/kilogram rem 1 Sv = 100 rems