人工晶体学报, 2023, 52 (12): 2161, 网络出版: 2024-01-03  

LaBr3∶Ce,Sr闪烁晶体的生长及性能研究

Growth and Properties Study of LaBr3∶Ce,Sr Scintillation Crystal
作者单位
1 北京中材人工晶体研究院有限公司,北京100018
2 中材人工晶体研究院有限公司,北京100018
3 中国科学院上海硅酸盐研究所,上海201899
摘要
采用自发成核坩埚下降法生长了直径25 mm的铈、锶共掺溴化镧(LaBr3∶5%Ce,x%Sr,简称LaBr3∶Ce,Sr,其中x=0.1、0.3、0.5,摩尔分数)闪烁晶体,测试对比了晶体的X射线激发发射光谱、透过光谱和脉冲高度谱等。结果表明,不同Sr2+掺杂浓度的LaBr3∶Ce,Sr晶体在X射线激发下的发射光谱波形基本一致,但相比未掺杂Sr2+的样品,发射峰的峰位发生了明显的红移,随着Sr2+掺杂浓度的增大,发射峰红移程度增大。不同Sr2+掺杂浓度的LaBr3∶Ce,Sr晶体在350~800 nm不存在明显的吸收峰,0.3%和0.5%Sr2+掺杂晶体的透过率有所降低。随着Sr2+掺杂浓度的增大,能量分辨率逐步提高,Sr2+掺杂浓度为0.5%时,LaBr3∶Ce,Sr晶体的能量分辨率最高,达2.99%@662 keV。对尺寸25 mm×25 mm的LaBr3∶Ce,0.5%Sr晶体进行了防潮封装,所得晶体封装件的能量分辨率为2.93%@662 keV。
Abstract
In this paper, 25 mm lanthanum bromide scintillation crystals with 5%Ce3+ and different Sr2+ doping concentrations (0.1%, 0.3%, 0.5% in molar ratio) were successfully grown by spontaneous nucleation vertical Bridgman method. Xray excited emission spectra, transmission spectra and pulse height spectra of these crystals were measured. Results show that, the emission spectra waveform of LaBr3∶Ce crystals with different Sr2+ doping concentrations is basically consistent under Xray excitation, and the emission peak shows a significant red shift compared with that of sample without Sr2+ doping. With the increase of Sr2+doping concentration, the emission peak of LaBr3∶Ce,Sr crystal shows a slight red shift. There is no obvious absorption peak range from 350 to 800 nm of LaBr3∶Ce,Sr crystals with different Sr2+ doping concentrations. Compared with LaBr3∶Ce crystals, transmittance of 0.3% and 0.5% Sr2+doped LaBr3∶Ce crystals decrease. In addition, with the increase of Sr2+doping concentration, the energy resolution of the crystal increases correspondingly. LaBr3∶Ce,0.5%Sr crystal has the highest energy resolution of 2.99%@662 keV. The energy resolution of the encapsulated LaBr3∶Ce,0.5%Sr crystal with size of 25 mm×25 mm is 2.93%@662 keV.

王海丽, 周南浩, 许婉芬, 张微, 李焕英, 韩加红, 陈建荣. LaBr3∶Ce,Sr闪烁晶体的生长及性能研究[J]. 人工晶体学报, 2023, 52(12): 2161. WANG Haili, ZHOU Nanhao, XU Wanfen, ZHANG Wei, LI Huanying, HAN Jiahong, CHEN Jianrong. Growth and Properties Study of LaBr3∶Ce,Sr Scintillation Crystal[J]. Journal of Synthetic Crystals, 2023, 52(12): 2161.

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