http://www.legislation.gov.uk/id/eudr/2013/59

CHAPTER IIISYSTEM OF RADIATION PROTECTION

SECTION 2 Dose limitation

Article 13Estimation of the effective and equivalent dose

For the estimation of effective and equivalent doses, the appropriate standard values and relationships shall be used. For external radiation, the operational quantities defined in section 2.3 of ICRP Publication 116 shall be used.