The BESSY electron storage ring as radiation standard in x ray field, and the determination of radionuclide photon emission probabilities

The suitability of the BESSY electron storage ring as a primary radiation standard was verified in a photon energy field. The extension of the usable spectral field to greater photon energies was obtained by an increase of electron energy from 750 to 850 MeV. The measurement processes for the determination of storage ring and geometry parameters were improved. A filter detector system and a gamma line of a radioactive standard were calibrated in order to examine possible deviations in the realized units at transfer from the radioactive standard to the storage ring standard. The quality of the radioactive standards considered was improved.