LaBr3∶Ce,Sr闪烁晶体的生长及性能研究

人工晶体学报 ›› 2023, Vol. 52 ›› Issue (12): 2161-2166.

LaBr₃∶Ce,Sr闪烁晶体的生长及性能研究

王海丽^1,2, 周南浩^1,2, 许婉芬², 张微^1,2, 李焕英³, 韩加红^1,2, 陈建荣^1,2

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

收稿日期:2023-08-11 出版日期:2023-12-15 发布日期:2023-12-26
作者简介:王海丽(1977—),女,山东省人,博士,教授级高工。E-mail:hailiwang02@163.com
基金资助:
国家重点研发计划(2022YFB3503600)

Growth and Properties Study of LaBr₃∶Ce,Sr Scintillation Crystal

WANG Haili^1,2, ZHOU Nanhao^1,2, XU Wanfen², ZHANG Wei^1,2, LI Huanying³, HAN Jiahong^1,2, CHEN Jianrong^1,2

1. Beijing Sinoma Synthetic Crystals Co., Ltd., Beijing 100018, China;
2. Sinoma Synthetic Crystals Co., Ltd., Beijing 100018, China;
3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China

Received:2023-08-11 Online:2023-12-15 Published:2023-12-26

摘要/Abstract

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ϕ25 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。

关键词: 闪烁晶体, LaBr₃∶Ce,Sr, 坩埚下降法, X射线激发发射光谱, 能量分辨率, 封装

Abstract: In this paper, ϕ25 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 ϕ25 mm×25 mm is 2.93%@662 keV.

Key words: scintillation crystal, LaBr₃∶Ce,Sr, vertical Bridgman method, X-ray excited emission spectra, energy resolution, encapsulation

中图分类号:

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): 2161-2166.

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): 2161-2166.

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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

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