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PreprintCC BY 4.0arXiv

Particle-dependent radioluminescence color response of Eu-doped CaF2 associated with energy-loss density

  • T. Iida
  • M. Yoshino
  • T. Moriguchi
  • A. Ozawa
  • S. Sugi
  • M. Mikawa
  • M. Mitsui
  • H. Kobayashi
  • Y. Saito
  • R. Iwamoto
  • K. J. Kim
  • K. Kamada
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Abstract

Europium-doped calcium fluoride (Eu:CaF2) exhibits characteristic blue Eu2+ and red Eu3+ emissions. In our previous study, the Eu3+/Eu2+ radioluminescence intensity ratio under α-particle irradiation was approximately twice that under X-ray irradiation. Here, we investigate the relationship between this emission ratio and energy-loss density using H, Li, C, and Ni ion beams produced by a tandem accelerator. Radioluminescence spectra were measured for each ion species, and the effective range-averaged energy-loss density was evaluated using SRIM simulations, spanning approximately 18 to 5900~keV/μm. The Eu3+/Eu2+ emission-intensity ratio increased systematically from H to C ions by approximately a factor of two, whereas no further systematic increase was observed for Ni ions at substantially higher energy-loss densities. Because the energy-loss density was varied mainly by changing the ion species, its effect cannot be fully separated from that of ion-specific track structure. The X-ray result, included for qualitative comparison, showed a lower emission ratio than the ion-beam measurements, although its effective energy-loss density was estimated only approximately. These results demonstrate a systematic variation in the emission color of Eu:CaF2 across different ion-beam irradiation conditions and provide baseline data for future studies of wavelength-resolved particle discrimination.

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Cite

BibTeXRIS
BibTeX
@misc{iida2026particledependent,
  title = {{Particle-dependent radioluminescence color response of Eu-doped CaF$_2$ associated with energy-loss density}},
  author = {T. Iida and M. Yoshino and T. Moriguchi and A. Ozawa and S. Sugi and M. Mikawa and M. Mitsui and H. Kobayashi and Y. Saito and R. Iwamoto and K. J. Kim and K. Kamada},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.36714},
  eprint = {2610.36714},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.36714},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Particle-dependent radioluminescence color response of Eu-doped CaF_2 associated with energy-loss density
AU  - T. Iida
AU  - M. Yoshino
AU  - T. Moriguchi
AU  - A. Ozawa
AU  - S. Sugi
AU  - M. Mikawa
AU  - M. Mitsui
AU  - H. Kobayashi
AU  - Y. Saito
AU  - R. Iwamoto
AU  - K. J. Kim
AU  - K. Kamada
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2610.36714
UR  - https://arxiv.org/abs/2610.36714
AB  - Europium-doped calcium fluoride (Eu:CaF_2) exhibits characteristic blue Eu^2+ and red Eu^3+ emissions. In our previous study, the Eu^3+/Eu^2+ radioluminescence intensity ratio under α-particle irradiation was approximately twice that under X-ray irradiation. Here, we investigate the relationship between this emission ratio and energy-loss density using H, Li, C, and Ni ion beams produced by a tandem accelerator. Radioluminescence spectra were measured for each ion species, and the effective range-averaged energy-loss density was evaluated using SRIM simulations, spanning approximately 18 to 5900~keV/μm. The Eu^3+/Eu^2+ emission-intensity ratio increased systematically from H to C ions by approximately a factor of two, whereas no further systematic increase was observed for Ni ions at substantially higher energy-loss densities. Because the energy-loss density was varied mainly by changing the ion species, its effect cannot be fully separated from that of ion-specific track structure. The X-ray result, included for qualitative comparison, showed a lower emission ratio than the ion-beam measurements, although its effective energy-loss density was estimated only approximately. These results demonstrate a systematic variation in the emission color of Eu:CaF_2 across different ion-beam irradiation conditions and provide baseline data for future studies of wavelength-resolved particle discrimination.
ER  -