Abstract: The 40 mm×40 mm×350 mm BaF₂:5%Y (mole fraction) crystals were grown by vertical Bridgman method. The doping content, scintillation properties, optical properties and irradiation damage of crystal samples were studied. The Y³⁺doping concentration (mole fraction) is 5.1%±0.9% within the range from 0 to 300 mm from seed end. The average light output of crystal sample is 2 100 ph/MeV, and the optimal energy resolution at 662 keV is 10.1%. After ⁶⁰Co source was used to irradiate the sample with an accumulated dose of 1 Mrad, the transmittance of the sample at 220 nm wavelength decreases from 87.3% before irradiation to 83.5%, the transmittance at 300 nm wavelength decreases from 91.8% to 89.9%. The anti-irradiation performance of BaF₂:Y crystal is worse than that of BaF₂ crystal. After the accumulative dose irradiation, the absorption of BaF₂:Y crystal to 300 nm light is significantly enhanced.

Key words: BaF₂:Y, scintillation crystal, Bridgman method, light output, irradiation damage, energy resolution