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タイトル: | Local coordination state of rare earth in eutectic scintillators for neutron detector applications. |
著者: | Masai, Hirokazu Yanagida, Takayuki Mizoguchi, Teruyasu Ina, Toshiaki Miyazaki, Takamichi Kawaguti, Noriaki Fukuda, Kentaro |
著者名の別形: | 正井, 博和 |
発行日: | 21-Aug-2015 |
出版者: | Nature Publishing Group |
誌名: | Scientific reports |
巻: | 5 |
論文番号: | 13332 |
抄録: | 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 Ca(2+) 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 Eu(2+) 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. |
著作権等: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
URI: | http://hdl.handle.net/2433/201627 |
DOI(出版社版): | 10.1038/srep13332 |
PubMed ID: | 26292726 |
出現コレクション: | 学術雑誌掲載論文等 |
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