[A Cerenkov detector to determine the energy in electron accelerators (author's transl)].

The authors present a Cerenkov threshold value detector consisting of elements originating from the commercial vacuum industry. This detector allows to measure electron energies between 8 MeV and 20 MeV. By the comparison of the signals of two photo-multipliers, a considerable independence of external disturbing factors is achieved. It is demonstrated that the results achieved with normal propane are not worse than those of super-purified gas and, therefore, a cheap and simple method is available in order to control the electron energy of accelerators.