Health Canada
www.hc-sc.gc.ca
Common menu bar links
Institutional links
Environmental and Workplace Health
Radiation Protection In Veterinary Medicine - Recommended Safety Procedures For Installation And Use Of Veterinary X-ray Equipment - Safety Code 28
Appendix V Radiation Measurement Units - International (SI) System
Exposure
The unit of COULOMB/KILOGRAM (C/kg) has not found acceptance as the replacement of the ROENTGEN (R) as a unit of irradiation.
Following the lead of the International Electrotechnical Commission, the AIR KERMA (in GRAYS) replaces the EXPOSURE (in ROENTGENS) as the measure of irradiation. The relationship between the two units is as follows:
1 Gy ~ 114.55 R
1 R ~ 8.73 mGy
1 mGy ~ 114.55 mR
1 mR ~ 8.73 µGy
Absorbed Dose
The GRAY (Gy) replaces the RAD (rad) as the unit of absorbed dose. The relationship between the two units is as follows:
1 Gy = 100 rad
1 rad = 10 mGy
1 mGy = 100 mrad
1 mrad = 10 µGy
Dose Equivalent
The SIEVERT (Sv) replaces the REM (rem) as the unit of DOSE EQUIVALENT. The relationship between the two units is as follows:
1 Sv = 100 rem
1 rem = 10 mSv
1 mSv = 100 mrem
1 mrem = 10 µSv
Note: m = milli = 10-3; µ = micro = 10-6
