Thermoluminescence efficiency and glow curves of Cr-doped Al2O3 ceramic TLD for a wide linear energy transfer range

Risa Shimomura, Yusuke Koba, Weishan Chang, Masanori Koshimizu, Yutaka Fujimoto, Hiroki Kawamoto, Daiki Maruyama, Kazuki Matsumoto, Hiroaki Ushiba, Takayuki Andoh, Kiyomitsu Shinsho

Research output: Contribution to journalArticle

Abstract

We investigated the thermoluminescence (TL) efficiency and the glow curve of Cr-doped alumina (Al2O3) ceramic thermoluminescent dosimeters (TLDs) for heavy charged particles. The TLDs were irradiated with beams of protons, helium, and carbon ions. A 6-MV X-ray was used as the reference radiation for investigating the relative TL efficiency. The relative TL efficiency reaches its peak when the linear energy transfer (LET) is approximately 6 keV/μm and decreases with increasing LET. Moreover, the relative TL efficiency was 1.09 for the helium beam (LET: 11.5 keV/μm) and 1.22 for the carbon beam (LET: 13.3 keV/μm). This indicates that the relative TL efficiency of a Cr-doped Al2O3 ceramic TLD varies not only with the LET but also with the particle species. In order to investigate the relationship between the trap center of the Cr-doped Al2O3 ceramic TLD and the LET, the glow curve for each irradiation condition was also measured. As a result, the shape of the glow curve remained the same for a wide LET range, between 0.5 keV/μm and 128 keV/μm.

Original languageEnglish
Article number106356
JournalRadiation Measurements
Volume134
DOIs
Publication statusPublished - 2020 Jun

Keywords

  • Glow curve
  • LET dependence
  • Particle beam

ASJC Scopus subject areas

  • Radiation
  • Instrumentation

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    Shimomura, R., Koba, Y., Chang, W., Koshimizu, M., Fujimoto, Y., Kawamoto, H., Maruyama, D., Matsumoto, K., Ushiba, H., Andoh, T., & Shinsho, K. (2020). Thermoluminescence efficiency and glow curves of Cr-doped Al2O3 ceramic TLD for a wide linear energy transfer range. Radiation Measurements, 134, [106356]. https://doi.org/10.1016/j.radmeas.2020.106356