Thermal neutron detection with Ce3+ doped LiCaAlF6 single crystals
Thermal neutron detection with Ce3+ doped LiCaAlF6 single crystals
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DOI：
10.1016/j.nima.2010.09.182
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发表时间：
2011-10-01
影响因子：
1.4
通讯作者：
Ishizu, Sumito
中科院分区：
文献类型：
--
作者：
Iwanowska, Joanna;Swiderski, Lukasz;Ishizu, Sumito
研究了铈掺杂LiCaAlF6 （Ce:LiCAF）晶体作为闪烁体在热中子探测中的应用。测试了三种晶体：高掺杂Ce:LiCAF、低掺杂Ce:LiCAF富集50% Li-6（均为10 mm × 10 mm × 2 mm，矩形）和高掺杂Ce:LiCAF富集95% Li-6 （050.8 mm × 2 mm，铁饼状）耦合到Photonis XP5300B PMT。研究了这些晶体对石蜡慢化(PuBe)-Pu-238源发射的中子的响应。高掺杂Ce:LiCAF （50% Li-6）的热中子峰值伽马当量能量（GEE）类似于2.5 MeV，低掺杂Ce:LiCAF （50% Li-6）的热中子峰值类似于2 MeV，高掺杂Ce:LiCAF （95% Li-6）的热中子峰值类似于1.9 MeV。还测量了Ce:LiCAF的光输出（175-250 phe/MeV）。来自圣戈班的锂-6玻璃GS20被用作参考闪烁体（050 mm x 2 mm，圆形）。计算了与GS20锂玻璃归一化后的相对中子效率，以及所有测试样品的γ -中子本征效率。小型Ce:LiCAF样品的热中子探测本征效率估计约为GS20的32-35%，大型Ce:LiCAF样品的热中子探测本征效率约为GS20的82%。(C) 2011 Elsevier B.V.版权所有
Cerium-doped LiCaAlF6 (Ce:LiCAF) crystals have been studied as scintillators in application to thermal neutron detection. Three crystals: high-doping Ce:LiCAF, low-doping Ce:LiCAF with 50% enrichment of Li-6 (both 10 mm x 10 mm x 2 mm, rectangular) and high-doping Ce:LiCAF with 95% enrichment of Li-6 (050.8 mm x 2 mm, discus) coupled to Photonis XP5300B PMT, were tested. The response of these crystals to neutrons emitted from a paraffin moderated (PuBe)-Pu-238 source has been investigated. Thermal neutron peaks have been found at a Gamma Equivalent Energy (GEE) of similar to 2.5 MeV for high-doping Ce:LiCAF (50% 6Li), similar to 2 MeV for low-doping Ce:LiCAF (50% Li-6) and similar to 1.9 MeV for high-doping Ce:LiCAF (95% Li-6). The light output of Ce:LiCAF was also measured (175-250 phe/MeV from sample to sample). Lithium-6 glass GS20 from Saint Gobain was used as a reference scintillator (050 mm x 2 mm, circle). Relative neutron efficiency, normalized to that of GS20 lithium glass, as well as gamma-neutron intrinsic efficiency for all tested samples was calculated. Intrinsic efficiency on thermal neutron detection for small Ce:LiCAF samples was estimated at about 32-35% of that of GS20 and for large Ce:LiCAF sample as about 82% of that of GS20. (C) 2011 Elsevier B.V. All rights reserved.