Comment on “Electron and gamma background in CRESST detectors”

The analysis of the background of CaWO4 detectors used in the CRESST experiment [1] is commented upon. We explore the possible contribution of the Bi-210 beta-radiation and its bremsstrahlung to the background spectra. We find that the bremsstrahlung from the external Bi-210 might satisfactorily account for most part of the continuous background spectrum in the 100–600 keV region, and that the detectors might thus come out practically free of the unpleasant Sr-90 contamination.