[en] Highlights: • Beta particle energy and angular dependence of incident radiation on the RPL signal emitted from the detectors. • Estimation of the gaps on the calibration according the angle of incidence on the detector. • Tampering of accurate dose assessment if the detector calibration is performed with beta-rays different from those monitored. -- Abstract: The radiophotoluminescent (RPL) signal of Ag-doped phosphate glass detectors to β-radiation is significantly influenced by β-particle energy. We investigate the β-particle energy and angular dependence of incident β radiation on the RPL signal emitted from the detectors. The results of measurements and MCNPX simulations show that the detector sensitivity decreases with increasing β-energy and has little dependence on the angle of incidence. The consequence is that a dose assessment will be strongly biased if the detector calibration is performed with β-rays different from those monitored.