Journal of Radiation Protection and Research

  • 제47권3호
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  • Pages.134-142
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  • 2022
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  • 2508-1888(pISSN)
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  • 2466-2461(eISSN)
대한방사선방어학회 (The Korean Association for Radiation Protection)
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Effects of Fully Filling Deep Electron/Hole Traps in Optically Stimulated Luminescence Dosimeters in the Kilovoltage Energy Range

  • Chun, Minsoo (Department of Radiation Oncology, Chung-Ang University Gwang Myeong Hospital) ;
  • Jin, Hyeongmin (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Lee, Sung Young (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Kwon, Ohyun (Department of Medical Physics, University of Wisconsin) ;
  • Choi, Chang Heon (Institute of Radiation Medicine, Seoul National University Medical Research Center) ;
  • Park, Jong Min (Institute of Radiation Medicine, Seoul National University Medical Research Center) ;
  • Kim, Jung-in (Institute of Radiation Medicine, Seoul National University Medical Research Center)
  • 투고 : 2021.09.24
  • 심사 : 2022.03.06
  • 발행 : 2022.09.30
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초록

Background: This study investigated the characteristics of optically stimulated luminescence dosimeters (OSLDs) with fully filled deep electron/hole traps in the kV energy ranges. Materials and Methods: The experimental group consisted of InLight nanoDots, whose deep electron/hole traps were fully filled with 5 kGy pre-irradiation (OSLDexp), whereas the non-pre-irradiated OSLDs were arranged as a control group (OSLDcont). Absorbed doses for 75, 80, 85, 90, 95, 100, and 105 kVp with 200 mA and 40 ms were measured and defined as the unit doses for each energy value. A bleaching device equipped with a 520-nm long-pass filter was used, and the strong beam mode was used to read out signal counts. The characteristics were investigated in terms of fading, dose sensitivities according to the accumulated doses, and dose linearity. Results and Discussion: In OSLDexp, the average normalized counts (sensitivities) were 12.7%, 14.0%, 15.0%, 10.2%, 18.0%, 17.9%, and 17.3% higher compared with those in OSLDcont for 75, 80, 90, 95, 100, and 105 kVp, respectively. The dose accumulation and bleaching time did not significantly alter the sensitivity, regardless of the filling of deep traps for all radiation qualities. Both OSLDexp and OSLDcont exhibited good linearity, by showing coefficients determination (R2) > 0.99. The OSL sensitivities can be increased by filling of deep electron/hole traps in the energy ranges between 75 and 105 kVp, and they exhibited no significant variations according to the bleaching time.

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과제정보

This work was supported by the National Research Foundation (NRF) of Korea grant funded by the Korean government (NRF-2019R1F1A1041944).

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