掺Sr2+溴化铈晶体的生长与闪烁性能研究.

25. 4 mm diameter crystals of CeB- and three analogues doped with 0.1%, 0. 2% and 0. 5% of Sr2 + in molar ratio were grown by the vertical Bridgman method. The grown crystals were processed into 25. 4 mm diameter wafer with a thickness of 10 mm and characterized by fluorescence spectra excited by UV light and X-ray as well as multi-channel analysis with 137 Cs source. Results show that the emission bands of the crystals under X-ray excitation are slightly red-shifted by Sr2 + doping, and with the increase of Sr2 + doping content, the energy resolution of the crystals are successively improved, while the light yield are gradually reduced. The CeB- crystal doped with 0. 5% Sr2 + exhibits the best energy resolution of 3. 83% @ 662 keV. However, high Sr2 + doping also causes difficulty in crystal growth. A doping content of 0. 2% is considered appropriate with regards to both scintillation property and crystal growth availability. An encapsulated CeBr3: 0. 2% Sr crystal with dimension of ©25.4 mm X25.4 mm is obtained and the energy resolution is 3. 92% @662 keV. [ABSTRACT FROM AUTHOR]