Local coordination state of rare earth in eutectic scintillators for neutron detector applications.
Local coordination state of rare earth in eutectic scintillators for neutron detector applications.
复制标题
DOI：
10.1038/srep13332
复制
发表时间：
2015-08-21
影响因子：
4.6
通讯作者：
Fukuda K
中科院分区：
文献类型：
--
作者：
Masai H;Yanagida T;Mizoguchi T;Ina T;Miyazaki T;Kawaguti N;Fukuda K
用于中子探测的磷光体中的原子分布尚未完全阐明，尽管它们的电离效率强烈地依赖于基质中的稀土的状态。在这项工作中，我们研究的Eu掺杂的80 LiF-20 CaF 2共晶的光学性质的中子探测器应用的基础上的Eu分布。在低浓度下，观察到Eu阳离子的聚集，而在CaF 2层中均匀的原子分散，以取代Ca 2+离子，在高浓度下的共晶中观察到。Eu LIII边缘X射线吸收精细结构（XAFS）分析表明，中子响应不依赖于Eu 2+离子的量。然而，透明度，这取决于一个有序的层状结构，被发现是重要的高的光产额在中子探测。结果证实了关于粒子辐射闪烁中辐射吸收剂和激活剂分离的基本思想的有效性，并为进一步改进新型体探测器提供了潜力。
Atomic distribution in phosphors for neutron detection has not been fully elucidated, although their ionization efficiency is strongly dependent on the state of the rare earth in the matrix. In this work, we examine optical properties of Eu-doped 80LiF-20CaF2 eutectics for neutron detector applications based on the Eu distribution. At low concentrations, aggregation of Eu cations is observed, whereas homogeneous atomic dispersion in the CaF2 layer, to substitute Ca2+ ions, is observed in the eutectics at high concentrations. Eu LIII edge X-ray absorption fine structure (XAFS) analysis suggests that neutron responses do not depend on the amount of Eu2+ ions. However, transparency, which depends on an ordered lamellar structure, is found to be important for a high light yield in neutron detection. The results confirm the effectiveness of the basic idea concerning the separation of radiation absorbers and activators in particle radiation scintillation and present potential for further improvement of novel bulk detectors.