This document specifies the procedures for the dosimetry of X and gamma reference radiation for the calibration of radiation protection instruments over the energy range from approximately 8 keV to 1,3 MeV and from 4 MeV to 9 MeV and for air kerma rates above 1 µGy/h. The considered measuring quantities are the air kerma free-in-air, K a , and the phantom related operational quantities of the International Commission on Radiation Units and Measurements (ICRU) [2] , H*(10), H p (10), H'(3), H p (3),H'(0,07) and H p (0,07), together with the respective dose rates. The methods of production are given in ISO 4037-1.
