This International Standard specifies the X and 7 reference radiations for calibrating protection level dosemeters and dose ratemeters* at exposure r?tes from 10~6C-kg-1-h~1 (a few mRh"1) to 10~2Ckg~1h~1 (of the order of tens of Rh"1), and for determining their response as a function of photon energy.
These radiations are :
— in the energy range 30 keV to 250 keV, continuous filtered X radiations and the 7 radiation of americium-241;
— in the energy range 8 keV to 100 keV, fluorescence X radiations;
— in the energy range 600 keV to 1,3 MeV, gamma radiations emitted by radioactive elements.
This International Standard establishes two series of X and 7 reference radiations from which, for a particular case, the radiations for calibrating an instrument and for determining its response as a function of photon energy shall beselected. These series are reviewed in table 1. An addendum will define other series, particularly for lower or higher exposure r?tes and for energies up to 6 MeV.