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。
To improve the neutron detection efficiency, Ce:Li6Lu(10BO3)3 crystal was grown by Czochralski method from the raw materials enriched with10B 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 Ce3+ 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 by137Csγ-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 keVγ-ray from137Cs was 20% that of CsI(Tl) 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)3crystal is a promising fast scintillator for neutron detection applications.
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