Effect of inorganic salt on the dose sensitivity of polymer gel dosimeter |
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| Authors: | Shin-ichiro Hayashi Fumiya Fujiwara Shuji Usui Takahiro Tominaga |
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| Institution: | 1. Department of Clinical Radiology, Faculty of Health Sciences, Hiroshima International University, Higashi-Hiroshima, Hiroshima 739-2695, Japan;2. Hiroshima International University Graduate School of Medical Technology and Health Welfare Sciences, Higashi-Hiroshima, Hiroshima 739-2695, Japan;1. Radiation Technology Center, Atomic Energy Research Institute, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia;2. Biomedical Physics Department, Research Center, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia;3. Medical Imaging Department, Faculty of Allied Health Sciences, Hashemite University, Zarqa, Jordan;1. Physics Department, Faculty of Science, Yarmouk University, Irbid, 21163, Jordan;2. Medical Imaging Department, Faculty of Allied Health Sciences, Hashemite University, Zarqa, Jordan;3. Ministry of Education, Amman, Jordan;4. Physics Department, Faculty of Science, Hashemite University, Zarqa, Jordan;1. 3D Gel Dosimeter Research Laboratory, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan;2. Department of Chemistry, School of Science, Kitasato University, 1-15-1 Kitasato, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan;3. Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;4. Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;5. Frontier Materials Research Department, Materials Research Laboratories, Nissan Chemical Industries, Ltd., 488-6 Suzumi-cho, Funabashi, Chiba 274-0052, Japan;6. Department of Neurosurgery, Himon''ya Hospital, 2-9-5 Minami-ku, Meguro, Tokyo 152-0013, Japan;7. Department of Nuclear Engineering and Management, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | The effect of inorganic salts, non-transition metal chlorides, on the dose sensitivity of methacrylic-acid-based polymer gel dosimeter is investigated. Dose-R2 responses are obtained from magnetic resonance imaging data. Temperature increase due to exothermic polymerization reaction in the gel is also measured directly during irradiation. As a result, substantial increases in R2 response are observed in the polymer gel dosimeter containing inorganic salt, especially with MgCl2. The sensitivity of the gel with 1.0 M MgCl2 is approximately 2.8 times higher than that of without MgCl2. As the salt concentration increases, an increase of polymerization rate is also observed via the temperature measurements. These results indicate that inorganic salt acts as an accelerator for radiation-induced free-radical polymerization in methacrylic-acid-based gel. |
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