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10.3390/cryst14020154
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Communication

Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator

by
Rei Sasaki
1,2,
Kei Kamada
2,3,4,*,
Masao Yoshino
3,4,
Kyoung Jin Kim
3,4,
Rikito Murakami
2,4,
Takahiko Horiai
3,4,
Akihiro Yamaji
2,3,
Shunsuke Kurosawa
2,3,5,
Yuui Yokota
2,3,
Hiroki Sato
2,3,
Yuji Ohashi
2,3,
Takashi Hanada
2 and
Akira Yoshikawa
2,3,4
1
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
2
Institute for Materials Research, Tohoku University, 2-1-1 Katahira Aoba-ku, Sendai, Miyagi 980-8577, Japan
3
New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
4
C&A corporation, 1-16-23 Ichibancho, Aoba-ku, Sendai, Miyagi 980-0811, Japan
5
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
*
Author to whom correspondence should be addressed.
Crystals 2024, 14(2), 154; https://doi.org/10.3390/cryst14020154
Submission received: 27 November 2023 / Revised: 25 January 2024 / Accepted: 29 January 2024 / Published: 31 January 2024
(This article belongs to the Section Inorganic Crystalline Materials)
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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.
Keywords: halide; scintillator; eutectic; vertical Bridgman (VB) method; thermal neutron; 6Li halide; scintillator; eutectic; vertical Bridgman (VB) method; thermal neutron; 6Li

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MDPI and ACS Style

Sasaki, R.; Kamada, K.; Yoshino, M.; Kim, K.J.; Murakami, R.; Horiai, T.; Yamaji, A.; Kurosawa, S.; Yokota, Y.; Sato, H.; et al. Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator. Crystals 2024, 14, 154. https://doi.org/10.3390/cryst14020154

AMA Style

Sasaki R, Kamada K, Yoshino M, Kim KJ, Murakami R, Horiai T, Yamaji A, Kurosawa S, Yokota Y, Sato H, et al. Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator. Crystals. 2024; 14(2):154. https://doi.org/10.3390/cryst14020154

Chicago/Turabian Style

Sasaki, Rei, Kei Kamada, Masao Yoshino, Kyoung Jin Kim, Rikito Murakami, Takahiko Horiai, Akihiro Yamaji, Shunsuke Kurosawa, Yuui Yokota, Hiroki Sato, and et al. 2024. "Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator" Crystals 14, no. 2: 154. https://doi.org/10.3390/cryst14020154

APA Style

Sasaki, R., Kamada, K., Yoshino, M., Kim, K. J., Murakami, R., Horiai, T., Yamaji, A., Kurosawa, S., Yokota, Y., Sato, H., Ohashi, Y., Hanada, T., & Yoshikawa, A. (2024). Fabrication and Properties for Thermal Neutron Detection of 6LiCl/Rb2CeCl5 Eutectic Scintillator. Crystals, 14(2), 154. https://doi.org/10.3390/cryst14020154

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