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

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...

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Veröffentlicht in:Radiation measurements 2020-06, Vol.134, p.106356, Article 106356
Hauptverfasser: Shimomura, Risa, Koba, Yusuke, Chang, Weishan, Koshimizu, Masanori, Fujimoto, Yutaka, Kawamoto, Hiroki, Maruyama, Daiki, Matsumoto, Kazuki, Ushiba, Hiroaki, Andoh, Takayuki, Shinsho, Kiyomitsu
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Sprache:eng
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Zusammenfassung: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. •The relative TL efficiencies of Cr-doped Al2O3 ceramic TLDs exhibited different trends for particle beams.•Their shape of the glow curve remains the same for a wide LET range.•In order to clarify the mechanism responsible for the change of the TL intensity, further studies are needed.
ISSN:1350-4487
1879-0925
DOI:10.1016/j.radmeas.2020.106356