Dosimetric shield evaluation with tungsten sheet in 4, 6, and 9 MeV electron beams |
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| Institution: | 1. Clinical Radiology Service Division, Kyoto University Hospital, Kyoto 606-8397, Japan;2. Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, 54 Kawara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan;1. Departments of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan;2. Kidney Care Unit, Kyushu University Hospital, Fukuoka, Japan;1. Department of Hematology, Graduate School of Medicine, Osaka City University, Osaka, Japan;2. Department of Gastroenterology, Graduate School of Medicine, Osaka City University, Osaka, Japan;3. Department of Diagnostic Pathology, Graduate School of Medicine, Osaka City University, Osaka, Japan;1. Department of Organ Transplantation and General Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan;2. Department of Organ Interaction Research Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan;1. Transplantation Center, National Center for Child Health and Development, Tokyo, Japan;2. Clinical Research Center, National Center for Child Health and Development, Tokyo, Japan;3. International Institute for Bio-Resource Research, Meiji University, Tokyo, Japan |
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| Abstract: | In electron radiotherapy, shielding material is required to attenuate beam and scatter. A newly introduced shielding material, tungsten functional paper (TFP), has been anticipated to become a very useful device that is lead-free, light, flexible, and easily processed, containing very fine tungsten powder at as much as 80% by weight. The purpose of this study was to investigate the dosimetric changes due to TFP shielding for electron beams. TFP (thickness 0–15 mm) was placed on water or a water-equivalent phantom. Percentage depth ionization and transmission were measured for 4, 6, and 9 MeV electron beams. Off-center ratio was also measured using film dosimetry at depth of dose maximum under similar conditions. Then, beam profiles and transmission with two shielding materials, TFP and lead, were evaluated. Reductions of 95% by using TFP at 0.5 cm depth occurred at 4, 9, and 15 mm with 4, 6, and 9 MeV electron beams, respectively. It is found that the dose tend to increase at the field edge shaped with TFP, which might be influenced by the thickness. TFP has several unique features and is very promising as a useful tool for radiation protection for electron beams, among others. |
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| Keywords: | Tungsten paper Electron beam Transmission Radiation shield |
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