溴化铈晶体的阴阳离子共掺生长方法研究

Study on the Growth Method of CeBr3 Crystal by Anionic and Cationic Co-doping

采用阴阳离子共掺法提高了溴化铈晶体质量。研究结果表明,通过掺杂F-能有效消除晶体开裂、潮解等缺陷,同时掺杂Sr^2+能提高晶体的光学线性输出及能量分辨率。采用改进的坩埚下降法进行晶体生长,掺杂摩尔分数为x(CeBr3)=98%,x(SrBr2)=2%,x(CeF3)=10%时,生长出 45 mm×90 mm的溴化铈晶体毛坯,切割成的器件经137Cs放射源662 keVγ线作用下能量分辨率可达4.0%。

The quality of cerium bromide(CeBr3)crystal was improved by using the anionic and cationic co-doped method.The results show that the defects such as cracking and fluidization can be effectively eliminated by doping F-,and the optical linear output and the energy resolution of the crystal can be improved by doping Sr^2+at the same time.The crystal blank of cerium bromide with 45 mm×90 mm was grown by Bridgman method,and the doping ratio was 98%CeBr3,2%SrBr2,10%CeF3.The energy resolution of the cut device is 4.0%under the action of 662 keV gamma ray of 137Cs radiation source.