本文使用垂直坩埚下降法制备了40 mm×40 mm×350 mm的BaF2:5%Y(摩尔分数)晶体, 并对晶体样品进行了掺杂含量、闪烁性能、光学性能和辐照损伤的研究。距离籽晶端0~300 mm范围内的Y3+掺杂浓度(摩尔分数)为5.1%±0.9%。晶体样品的平均光输出为2 100 ph/MeV, 在662 keV处的最优能量分辨率为10.1%。经60Co放射源辐照累积剂量1 Mrad后, 样品在波长220 nm处的透过率由辐照前的87.3%下降至83.5%, 在波长300 nm处的透过率由91.8%下降至89.9%。BaF2:Y晶体的抗辐照性能差于BaF2晶体, 经过累积剂量辐照后, BaF2:Y晶体对波长300 nm光的吸收明显增强。

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.