Development of a 2D dosimetry system based on the optically stimulated luminescence of Al2O3 |
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| Affiliation: | 1. Physics Department, Oklahoma State University, Stillwater, OK 74078, USA;2. Department of Radiation Oncology, The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA;3. Landauer, Inc., Stillwater Crystal Growth Division, Stillwater, OK 74074, USA;4. St. John Medical Center, 1923 S. Utica Ave., Tulsa, OK 74104, USA;1. Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel;2. Redwood Scientific Incorporated, Pacifica, CA 94044-4300, USA;3. Physics Department, McDaniel College, Westminster, MD 21157, USA;1. The Research Institute of Natural Science and Department of Physics, Gyeongsang National University, Jinju 660-701, Republic of Korea;2. Health Physics Team, Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Daejeon 305-600, Republic of Korea;1. Department of Physics, Carleton Laboratory for Radiotherapy Physics, HP3302, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6;2. Department of Radiation Physics, Unit 94, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA;1. Physics Department, Oklahoma State University, 145 Physical Sciences, Stillwater, OK 74078, USA;2. Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA;3. Naval Surface Warfare Center, Indian Head Explosive Ordnance Disposal Technology Division (NSWC IHEODTD), Indian Head, MD 20640, USA;1. Departamento de Física, Universidade Federal de Sergipe, Av. Marechal Rondon, S/N, 49.100-000, São Cristóvão, SE, Brazil;2. Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, IPEN/CNEN-SP, Av. Prof. Lineu Prestes 2242, 05508-000, São Paulo, Brazil;3. Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06511, USA;4. Scuola di Ingegneria, Università di Pisa, Largo L. Lazzarino 2, Pisa I-56125, Italy |
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| Abstract: | A laser-scanning 2D dosimetry system based on the Optically Stimulated Luminescence (OSL) signal from Al2O3 films was built and demonstrated. The main challenge of using the OSL from Al2O3 for 2D dosimetry by laser scanning is the long lifetime (∼35 ms) of the main luminescence centers in this material (F-centers). In this work, we demonstrated the possibility of performing 2D dosimetry by laser scanning using a combination of the fast UV emission of F+-centers (lifetime <7 ns) and the slow F-center emission of Al2O3:C, and an algorithm to correct for the slow F-center luminescence lifetime. We also investigated the possibility of using Al2O3:C,Mg, to take advantage of its greater F+-center emission compared to Al2O3:C. Results from 6 MV photon beam irradiations from a clinical linear accelerator were compared to radiographic and radiochromic film profiles showing a good qualitative agreement. |
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| Keywords: | OSL 2D dosimetry Laser scanning |
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