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Investigation of the Microstructure and Scintillation Properties of Ce-Doped CaF 2 /LiF Eutectics for Thermal Neutron Detection.

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Title: Investigation of the Microstructure and Scintillation Properties of Ce-Doped CaF 2 /LiF Eutectics for Thermal Neutron Detection.
Authors: Matsuyama, Tomoaki1,2 (AUTHOR), Kamada, Kei2,3,4 (AUTHOR), Yoshino, Masao2,3 (AUTHOR), Murakami, Rikito2,4 (AUTHOR), Ishizawa, Satoshi1,2 (AUTHOR), Yokota, Yuui2,4 (AUTHOR), Yoshikawa, Akira2,3,4 (AUTHOR)
Source: Materials (1996-1944). Mar2026, Vol. 19 Issue 6, p1102. 14p.
Subjects: Scintillators, Microstructure, Neutron temperature, Radioluminescence, Neutron counters, Photoluminescence, Decommissioning of nuclear power plants
Abstract: With the growing global emphasis on nuclear reactor decommissioning, reliable thermal neutron detection has become increasingly important for ensuring critical safety and for the identification of fuel debris and radioactive waste. In this context, this study developed and characterized a Ce-doped CaF2/6LiF (Ce:CaF2/LiF) eutectic scintillator for thermal neutron detection with Ce concentrations ranging from 0.5 to 10 mol%. The eutectic samples were grown by the melt-solidification method, and their crystalline properties were evaluated using inductively coupled plasma mass spectrometry, X-ray diffraction, scanning electron microscopy, and field-emission electron probe microanalysis. Radioluminescence, photoluminescence, transmittance, scintillation decay, and pulse-height measurements were conducted to assess their scintillation performance. Structural characterization revealed a well-defined eutectic microstructure together with several Ce-rich phases. The results of the effective neutron sensitivity demonstrated that the Ce concentration was effectively optimized based on the effective neutron sensitivity: the sample with 1 mol% Ce exhibited the highest neutron sensitivity (approximately 1.5 times that of a Ce:LiCaAlF6 single crystal) and a 1.6-times higher neutron-induced light yield, while maintaining a fast effective decay time of 400 ns. These findings suggest that the Ce:CaF2/LiF eutectic is a promising candidate for high-performance thermal-neutron scintillators for applications in nuclear decommissioning. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Investigation of the Microstructure and Scintillation Properties of Ce-Doped CaF 2 /LiF Eutectics for Thermal Neutron Detection.
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  Data: <searchLink fieldCode="AR" term="%22Matsuyama%2C+Tomoaki%22">Matsuyama, Tomoaki</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kamada%2C+Kei%22">Kamada, Kei</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yoshino%2C+Masao%22">Yoshino, Masao</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Murakami%2C+Rikito%22">Murakami, Rikito</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ishizawa%2C+Satoshi%22">Ishizawa, Satoshi</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yokota%2C+Yuui%22">Yokota, Yuui</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yoshikawa%2C+Akira%22">Yoshikawa, Akira</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Mar2026, Vol. 19 Issue 6, p1102. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Scintillators%22">Scintillators</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+temperature%22">Neutron temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Radioluminescence%22">Radioluminescence</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+counters%22">Neutron counters</searchLink><br /><searchLink fieldCode="DE" term="%22Photoluminescence%22">Photoluminescence</searchLink><br /><searchLink fieldCode="DE" term="%22Decommissioning+of+nuclear+power+plants%22">Decommissioning of nuclear power plants</searchLink>
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  Data: With the growing global emphasis on nuclear reactor decommissioning, reliable thermal neutron detection has become increasingly important for ensuring critical safety and for the identification of fuel debris and radioactive waste. In this context, this study developed and characterized a Ce-doped CaF2/6LiF (Ce:CaF2/LiF) eutectic scintillator for thermal neutron detection with Ce concentrations ranging from 0.5 to 10 mol%. The eutectic samples were grown by the melt-solidification method, and their crystalline properties were evaluated using inductively coupled plasma mass spectrometry, X-ray diffraction, scanning electron microscopy, and field-emission electron probe microanalysis. Radioluminescence, photoluminescence, transmittance, scintillation decay, and pulse-height measurements were conducted to assess their scintillation performance. Structural characterization revealed a well-defined eutectic microstructure together with several Ce-rich phases. The results of the effective neutron sensitivity demonstrated that the Ce concentration was effectively optimized based on the effective neutron sensitivity: the sample with 1 mol% Ce exhibited the highest neutron sensitivity (approximately 1.5 times that of a Ce:LiCaAlF6 single crystal) and a 1.6-times higher neutron-induced light yield, while maintaining a fast effective decay time of 400 ns. These findings suggest that the Ce:CaF2/LiF eutectic is a promising candidate for high-performance thermal-neutron scintillators for applications in nuclear decommissioning. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/ma19061102
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        PageCount: 14
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      – SubjectFull: Scintillators
        Type: general
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      – SubjectFull: Neutron temperature
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      – SubjectFull: Decommissioning of nuclear power plants
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      – TitleFull: Investigation of the Microstructure and Scintillation Properties of Ce-Doped CaF 2 /LiF Eutectics for Thermal Neutron Detection.
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              M: 03
              Text: Mar2026
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