Determination of field output correction factors of radiophotoluminescence glass dosimeter and CC01 ionization chamber and validation against IAEA-AAPM TRS-483 code of practice |
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| Institution: | 1. Medical Physics Program, Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand;2. Department of Physics, Faculty of Sciences, Chulalongkorn University, Bangkok, Thailand;3. Department of Radiation Oncology, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand;4. Health Sciences North, Sudbury, Ontario, Canada;5. Northern Ontario School of Medicine, Sudbury, Ontario, Canada;6. Medical Physics Unit, McGill University, Montreal, Québec H3G 1A4, Canada;1. Department of Medical Imaging, Nimes University Hospital, Univ Montpellier, Medical Imaging Group Nimes, EA 2992, France;2. Department of Medical Physics, CHU Nimes, Univ Montpellier, Montpellier, France;3. ISERIS Imagerie médicale, 25 rue de Clémentville, Montpellier, France;1. Princess Margaret Cancer Centre, University Health Network, Department of Radiation Oncology, University of Toronto, 610 University Avenue, Toronto, Ontario M5G 2M9, Canada;2. Modus QA, London, Ontario N6H 5L6, Canada;3. Cross Cancer Institute, Alberta Health Services, Department of Radiation Oncology, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada;1. University Clinic for Medical Radiation Physics, Medical Campus Pius-Hospital, Carl von Ossietzky University, Oldenburg, Germany;2. Prof. em., Medical Physics and Biophysics, Georg-August University, Göttingen, Germany;1. Université de Strasbourg, CNRS, IPHC UMR 7178, F-67037, Strasbourg Cedex 2, France;2. Département de physique, Université des Sciences, des Techniques et Technologies, BP E3206, Bamako, Mali;3. Laboratory of Physics and Modeling, EDST, Lebanese University, 1300, Tripoli, Lebanon;1. QST Hospital, National Institutes for Quantum and Radiological Science and Technology, Japan;2. Association for Nuclear Technology in Medicine, Japan;3. Tokyo Bay Advanced Imaging & Radiation Oncology Makuhari Clinic, Japan;4. Aichi Cancer Center Hospital, Japan;5. Komazawa University, Japan;6. Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Japan;7. Graduate School of Medicine, Kyoto University, Japan |
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| Abstract: | PurposeTo determine the field output correction factors of the radiophotoluminescence glass dosimeter (RPLGD) in parallel and perpendicular orientations with reference to CC01, the ionization chamber.MethodsThe dose to a small water volume and the sensitive volume of the RPLGD and the IBA-CC01 were determined for 6-MV, 100-cm SAD, 10-cm depth using egs_chamber user-code. The RPLGD in perpendicular and parallel orientations to the beam axis were studied. The field output correction factors of each detector for 0.5 × 0.5 to 10 × 10 cm2 field sizes were determined. These field output correction factors were validated by comparing field output factors against data determined from IAEA-AAPM TRS-483 code of practice.ResultsThe field output correction factors of all detectors were within 5% for field sizes down to 0.8 × 0.8 cm2. For 0.5 × 0.5 cm2, the field output correction factors of CC01, RPLGD in perpendicular and parallel orientations differed from unity by 14%, 19%, and 5%, respectively. The percentage difference between field output factors determined using RPLGD and CC01 data, corrected using the field output correction factors determined in this work and measurements with CC01 data corrected using TRS-483, was less than 3% for all field sizes, except for the smallest field size of RPLGD in perpendicular orientation and the CC01.ConclusionsThe field output correction factors of RPLGD and CC01 are reported. The validation proves that RPLGD in parallel orientation combined with the field output correction factors is the most suitable for determining the field output factors for the smallest field used in this study. |
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| Keywords: | egs_chamber Field output correction factors Radiophotoluminescence glass dosimeter Small field dosimetry |
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