Gray / second (Gy/s): multiples and submultiples 
symbol Gy
1 Gy = 1 J/Kg 1 Gy = 100 rad The gray is the unit of ionizing radiation dose in the International System of Units (SI), defined as the absorption of one joule of radiation energy per kilogram of matter. The rad is a unit of absorbed radiation dose, defined as 1 rad = 0.01 Gy = 0.01 J/kg. 
