富集10B的Ce:Li6Lu(10BO3)3晶体生长及其闪烁性能

doi:10.15541/jim20150080

无机材料学报 ›› 2015, Vol. 30 ›› Issue (8): 809-813.DOI: 10.15541/jim20150080 CSTR: 32189.14.10.15541/jim20150080

富集¹⁰B的Ce:Li₆Lu(¹⁰BO₃)₃晶体生长及其闪烁性能

刘玮^{1, 2}, 潘尚可¹, 李焕英¹, 蒋勇³, 陈晓峰¹, 任国浩¹

(1. 中国科学院上海硅酸盐研究所, 上海201899; 2. 中国科学院大学, 北京100049; 3. 中国工程物理研究院核物理与化学研究所, 绵阳621900)

收稿日期:2015-02-05 修回日期:2015-04-04 出版日期:2015-08-20 网络出版日期:2015-07-21
作者简介:刘玮(1990–), 男, 硕士研究生. E-mail: liuwei@student.sic.ac.cn
基金资助:
国家自然科学基金(51272263, 11475242) National Natural Science Foundation of China (51272263, 11475242)

Growth and Scintillation Properties of Ce:Li₆Lu(¹⁰BO₃)₃ Crystal

LIU Wei^{1, 2}, PAN Shang-Ke¹, LI Huan-Ying¹, JIANG Yong³, CHEN Xiao-Feng¹, REN Guo-Hao¹

(1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, China. 2. University of Chinese Academy of Sciences, Beijing 100049, China. 3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China)

Received:2015-02-05 Revised:2015-04-04 Published:2015-08-20 Online:2015-07-21
About author:LIU Wei. E-mail: liuwei@student.sic.ac.cn

摘要/Abstract

摘要：

为了提高中子探测效率, 以富集¹⁰B的H₃¹⁰BO₃为原料, 通过提拉法生长了富集¹⁰B的Ce:Li₆Lu(¹⁰BO₃)₃晶体。X射线激发发射光谱测试表明: 其发光峰位于360~480 nm, 属于Ce³⁺离子典型的5d - 4f跃迁发光, 其闪烁发光效率为BGO晶体的3.9倍。在350 nm紫外光和¹³⁷Cs所发出的662 keV的γ射线激发下测得的衰减时间分别为21.0 ns 和31.7 ns, 在¹³⁷Cs辐射源激发下所测得的相对光输出是CsI(Tl)晶体的20%, 能量分辨率为9.7%。在慢化²⁵²Cf中子源激发下可以观测到明显的中子全能峰, 其能量分辨率为33%。上述研究结果表明, Ce:Li₆Lu(¹⁰BO₃)₃晶体具有较高的闪烁效率、快的衰减时间和良好的中子探测效率, 是一种具有应用前景的中子探测用闪烁晶体。

关键词: Ce:Li6Lu(10BO3)3晶体, 中子探测, 提拉法, 闪烁晶体

Abstract:

To improve the neutron detection efficiency, Ce:Li₆Lu(¹⁰BO₃)₃ crystal was grown by Czochralski method from the raw materials enriched with ¹⁰B isotopes. The X-ray excited luminescence of Ce:Li₆Lu(¹⁰BO₃)₃ crystal presents an emission band from 360 nm to 480 nm corresponding to 5d - 4f transitions of Ce³⁺ ions. The scintillation efficiency of Ce:Li₆Lu (¹⁰BO₃)₃ crystal was 3.9 times as large as that of BGO crystal, and the photoluminescence decay time excited by 350 nm and scintillation decay time excited by ¹³⁷Cs γ-ray source were 21.0 ns and 31.7 ns, respectively. The relative light output of Ce:Li₆Lu(¹⁰BO₃)₃ crystal excited with 662 keV γ-ray from ¹³⁷Cs was 20% that of CsI(Tl) crystal and the energy resolution was measured to be 9.7%. In the neutron energy spectrum excited by moderated²⁵²Cf neutron source, the obvious full energy peak of neutron was observed and the energy resolution was 33%. With the relatively high scintillation efficiency, fast decay time and good neutron detection efficiency, Ce:Li₆Lu(¹⁰BO₃)₃crystal is a promising fast scintillator for neutron detection applications.

Key words: Ce:Li6Lu(10BO3)3 crystal, neutron detection, Czochralski method, scintillation crystal

中图分类号:

O734

刘玮, 潘尚可, 李焕英, 蒋勇, 陈晓峰, 任国浩. 富集¹⁰B的Ce:Li₆Lu(¹⁰BO₃)₃晶体生长及其闪烁性能[J]. 无机材料学报, 2015, 30(8): 809-813.

LIU Wei, PAN Shang-Ke, LI Huan-Ying, JIANG Yong, CHEN Xiao-Feng, REN Guo-Hao. Growth and Scintillation Properties of Ce:Li₆Lu(¹⁰BO₃)₃ Crystal[J]. Journal of Inorganic Materials, 2015, 30(8): 809-813.

图/表 8

图1 Ce:Li6Lu(10BO3)3晶体照片

Fig. 1 Photo of Ce:Li6Lu(10BO3)3 crystal

图2 Ce:Li6Lu(10BO3)3粉末的XRD图谱

Fig. 2 XRD patterns of Ce:Li6Lu(10BO3)3 powder

图3 Ce:Li6Lu(10BO3)3和BGO晶体的X射线激发发射光谱

Fig. 3 X-ray excited luminescence spectra of Li6Lu(10BO3)3 and BGO crystal Inset is the integrated intensity of the emission band

图 4 Ce:Li6Lu (10BO3)3晶体的紫外可见光激发发射光谱

Fig. 4 UV-Vis excitation and emission spectra of the Ce:Li6 Lu(10BO3)3 crystal

图5 Ce:Li6Lu (10BO3)3晶体的光致发光衰减时间谱及其拟合曲线

Fig. 5 Photoluminescence decay curves and the fitted result of Ce:Li6Lu(10BO3)3 scintillators excited by 350 nm

图6 Ce:Li6Lu(10BO3)3晶体的闪烁衰减时间谱及其拟合曲线

Fig. 6 Decay curve of Ce:Li6Lu(10BO3)3 crystal and the fitted result

图7 Ce:Li6Lu(10BO3)3和CsI(Tl)晶体多道能谱对比

Fig. 7 Multi-channel energy spectra of Ce:Li6Lu(10BO3)3 crystal and CsI(Tl) crystal excited by 137Cs

图8 Ce:Li6Lu(10BO3)3晶体的中子能谱

Fig. 8 Multi-channel energy spectrum of Ce:Li6Lu(10BO3)3 crystal with Cd and without Cd excited by neutron source

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富集¹⁰B的Ce:Li₆Lu(¹⁰BO₃)₃晶体生长及其闪烁性能

Growth and Scintillation Properties of Ce:Li₆Lu(¹⁰BO₃)₃ Crystal

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