Government of Canada / Gouvernement du Canada
Symbol of the Government of Canada


Radiation Protection Regulations (SOR/2000-203)

Regulations are current to 2020-12-28 and last amended on 2020-11-25. Previous Versions

SCHEDULE 2(Subsection 1(1))

Radiation Weighting Factors

Column 1Column 2
ItemType of RadiationWeighting Factor
1Photons, all energies1
2Electrons and muons, all energiesFootnote for Radiation Weighting Factors11
3Protons and charged pions2
4Alpha particles, fission fragments and heavy ions20
5NeutronsA continuous function of neutron energyFootnote for Radiation Weighting Factors2
  • Return to footnote 1Excluding Auger electrons emitted from nuclei bound to DNA.

  • Return to footnote 2Radiation weighting factors for these neutrons may also be obtained by referring to the continuous curve shown in Figure 1, and Equation 4.3, on page 66 of the English version of The 2007 Recommendations of the International Commission on Radiological Protection, ICRP Publication 103, published in 2007.

  • SOR/2020-237, s. 23
Date modified: