Ionization density dependence of the curve shape and ratio of blue to UV emissions of Al2O3:C optically stimulated luminescence detectors exposed to 6-MV photon and therapeutic proton beams |
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| Institution: | 1. Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA;2. Graduate School of Biomedical Sciences, The University of Texas, Houston, TX 77030, USA;3. Department of Medical Physics, The Ottawa Hospital Cancer Centre, Ottawa, ON K1H 8L6, Canada;4. National Research Council of Canada, Ottawa, ON K1A 0R6, Canada;1. Ural Federal University, 19 Mira Str., 620002, Ekaterinburg, Russia;2. Physics Department, McDaniel College, Westminster, MD, 21157, USA;1. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-Cho, Ikoma, Nara 630-0192, Japan;2. Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;3. Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan;4. Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;5. Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan;1. Soreq Nuclear Research Center, Yavne, Israel;2. Physics Unit, Sami Shamoon College of Engineering, Beersheva, Israel;3. Department of Biotechnology, Ben Gurion University of the Negev, Beersheva, Israel;4. Physics Department, Ben Gurion University of the Negev, Beersheva, Israel;1. Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Krakow, Poland;2. Charite-Universtatsmedizin Berlin, BerlinProtonen am Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;1. Radiation Measurement Research Section, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan;2. Oarai Research Center, Chiyoda Technol Corporation, Ibaraki, Japan;3. Research Institute for Science and Engineering, Waseda University, Tokyo, Japan;4. College of Industrial Technology, Nihon University, Chiba, Japan |
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| Abstract: | In this work we characterized the dose and linear energy transfer (LET) (ionization density) dependence of commercial Al2O3:C optically stimulated luminescence (OSL) detectors (OSLDs) exposed to clinical photon and proton beams. We characterized the dose-dependence of the OSL signal, OSL curve shape, and the relative intensities of the blue and ultraviolet (UV) OSL emission bands using different readout protocols and beam qualities. We irradiated OSLDs with absorbed doses ranging from 0.1 Gy to 100 Gy in a 6-MV photon beam and from 0.1 Gy to 50 Gy in 140- and 250-MeV proton beams. Readouts were done with both continuous-wave (CWOSL) and pulsed (POSL) stimulation. The linearity of the OSLD dose–response depended on readout protocol and radiation type. Improved linearity was found for OSLDs irradiated with beams of increased LET, and for OSL signals containing only the blue emission band of Al2O3:C (which remained linear for doses up to 10 Gy for 140-MeV proton beam irradiations). The OSL curve shape did not vary with dose in the low-dose region (below 5 Gy depending on readout protocol), but beyond this, curves decayed more rapidly with increasing dose. Similarly, the ratio of blue to UV emission band intensities in the OSL signal did not vary with dose up to 5 Gy (depending on readout protocol), beyond which the ratio decreased with increasing dose. Because both the OSL curve shape and the ratio of blue to UV emission intensities have been investigated as potential parameters for measurements of LET, the constancy of these two quantities at doses relevant to radiotherapy is encouraging for the potential development of novel OSL methods to measure LET. Our findings are expected to contribute to the development of (i) improved readout protocols for commercially available Al2O3:C OSLDs and (ii) methods to measure radiation quality and LET. |
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| Keywords: | Optically stimulated luminescence Proton therapy Linear energy transfer Radiation dosimetry |
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