0.5, 1.0, 5.0, and 10.0 mol% Dy-doped 50NaPO 3 -50Al(PO 3 ) 3 glasses were synthesized by the melt-quenching method. All the samples had a high transmittance of up to 90% at visible wavelengths, and some intense emission lines were observed in their photoluminescence and scintillation spectra. When the glasses were irradiated with X-rays with various doses, a linear relationship between the irradiation dose and the thermally stimulated luminescence intensity was confirmed from 10 to 10000 mGy.