Das Spektrum der Bremsstrahlung eines 500 MeV-Elektronen-Synchrotrons

At the Bonn 500 MeV Electronsynchrotron the spectrum of the Bremsstrahlung has been investigated for several maximum-energies between 250 MeV and 450 MeV and under various angles to the axes of theγ-ray. The upper limit of the spectrum has been measured carefully in respect to later experiments with photon difference method. The absolute errors of 4.5% permitted a control of the quantameter calibration or the cross-section for electron pair production.