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 ke V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Cs I(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。
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 pre- sents an emission band from 360 nm to 480 nm corresponding to 5d - 4f transitions of Ce^3＋ ions. The scintillation effi- ciency 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, respec- tively. The relative light output of Ce：Li6Lu（10BO3）3 crystal excited with 662 keV ）,-ray from 137Cs was 20% that of CsI（T1） crystal and the energy resolution was measured to be 9.7%. In the neutron energy spectrum excited by moder- ated 252Cf 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）3 crystal is a promising fast scintillator for neutron detection applications.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第8期809-813,共5页
Journal of Inorganic Materials
基金
国家自然科学基金(51272263
11475242)~~
