Radiation Exposure and Dose Units
Radiation Exposure Unit: Roentgen or C/kg units for exposure in the air
Absorbed Dose Unit: RAD or cGy units
Dose Equivalent Unit: REM or cSv units
The Roentgen, RAD and REM are almost all equivalent for X-ray energies
1 RAD = 1000 mRAD 100 RAD = 1 Gy