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- Title
Fabrication and Properties for Thermal Neutron Detection of 6 LiCl/Rb 2 CeCl 5 Eutectic Scintillator.
- Authors
Sasaki, Rei; Kamada, Kei; Yoshino, Masao; Kim, Kyoung Jin; Murakami, Rikito; Horiai, Takahiko; Yamaji, Akihiro; Kurosawa, Shunsuke; Yokota, Yuui; Sato, Hiroki; Ohashi, Yuji; Hanada, Takashi; Yoshikawa, Akira
- Abstract
The 3He gas is commonly used for the detection of thermal neutrons. However, with the depletion of 3He gas, there is a need to develop new solid scintillators for thermal neutron detection. Solid scintillators containing 6Li, which have large neutron capture cross-sections and a large amount of energy released by transmutation reactions, are commonly used as alternative candidates. However, only single-crystal scintillators are currently used, and their 6Li concentration is limited by their chemical composition. In this study, we designed, grew, and evaluated a new eutectic scintillator, Rb2CeCl5/LiCl, which can improve the 6Li concentration compared with single-crystal scintillators. Rb2CeCl5, which was selected as the scintillator phase, has excellent scintillator properties (light yield: 36,000 photons/MeV, decay time: mostly 24 ns, slightly 153 ns), and is less deliquescent than other halide scintillators. The crystal grown using the vertical Bridgman method exhibited a eutectic phase composed of Rb2CeCl5 and LiCl. The eutectic crystals exhibited Ce3+ 5d-4f emissions, with a peak between 360 and 370 nm. The Rb2CeCl5 phase was identified as the luminescent phase via cathodoluminescence mapping, and 16,000 photons/neutron of the light yield and 56.1 ns of the decay time were observed. This study indicates that the Rb2CeCl5/LiCl eutectic scintillator is a promising candidate for use in thermal neutron detectors.
- Subjects
NEUTRON counters; THERMAL neutrons; SCINTILLATORS; THERMAL properties; EUTECTICS; NEUTRON capture; LITHIUM chloride; CATHODOLUMINESCENCE
- Publication
Crystals (2073-4352), 2024, Vol 14, Issue 2, p154
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst14020154