LaBr<sub>3</sub>∶Ce,Sr闪烁晶体的生长及性能研究

王海丽; 周南浩; 许婉芬; 张微; 李焕英; 韩加红; 陈建荣

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

论文大纲

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

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.

参考文献

[1] VAN LOEF E V D, DORENBOS P, VAN EIJK C W E, et al. Highenergyresolution scintillator: Ce3+ activated LaBr3［J］. Applied Physics Letters, 2001, 79(10): 15731575.

[2] CHEN H B, ZHOU C Y, YANG P Z, et al. Growth of LaBr3∶Ce3+single crystal by vertical Bridgman process in nonvacuum atmosphere［J］. Journal of Material Science Technology, 2009, 25(6): 753757.

[3] 史宏声, 秦来顺, 魏钦华, 等. 自发成核Bridgman法生长LaBr3∶Ce晶体［J］. 人工晶体学报, 2010, 39(S1): 231233.

[4] 桂强, 张春生, 张明荣, 等. 大尺寸掺氯化铈的溴化镧晶体生长及闪烁性能研究［J］. 核电子学与探测技术, 2011, 31(11): 11951197+1249.

[5] 丁言国, 包汉波, 李正国, 等. LaBr3∶Ce晶体生长及物理特性的研究［J］. 硅酸盐通报, 2014, 33(3): 476481.

[6] 王海丽, 陈建荣, 李辉, 等. LaBr3∶ Ce闪烁晶体的生长及性能研究［J］. 人工晶体学报, 2018, 47(6): 11921196.

[7] YANG K, MENGE P R, BUZNIAK J J, et al. Performance improvement of large Sr2+ and Ba2+ codoped LaBr3∶ Ce3+ scintillation crystals［C］//2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC). October 27November 3, 2012, Anaheim, CA, USA. IEEE, 2013: 308311.

[8] ALEKHIN M S, DE HAAS J T M, KHODYUK I V, et al. Improvement of γray energy resolution of LaBr3∶ Ce3+ scintillation detectors by Sr2+ and Ca2+ codoping［J］. Applied Physics Letters, 2013, 102(16): 161915.

[9] ALEKHIN M S, BINER D A, KRMER K W, et al. Improvement of LaBr3∶5%Ce scintillation properties by Li+, Na+, Mg2+, Ca2+, Sr2+, and Ba2+ codoping［J］. Journal of Applied Physics, 2013, 113(22): 224904.

[10] 罗亮, 王承二, 余金秋. 掺Sr2+溴化铈晶体的生长与闪烁性能研究［J］. 人工晶体学报, 2022, 51(8): 13371342.

[11] BERG D, SADIGH B, SCHLEIFE A, et al. Origin of resolution enhancement by codoping of scintillators: insight from electronic structure calculations［J］. Applied Physics Letters, 2014, 104(21): 211908.

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.

LaBr₃∶Ce,Sr闪烁晶体的生长及性能研究

关于本站 Cookie 的使用提示

全站搜索

LaBr3∶Ce,Sr闪烁晶体的生长及性能研究

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索

LaBr₃∶Ce,Sr闪烁晶体的生长及性能研究