量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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In cancer radiation therapy, the visualization of radiation patterns is absolutely necessary for precisely evaluating the dose distribution and improving dose
targeting. Recently, we developed a new type of gel dosimeter that uses color changes produced by iodine reaction with polyvinyl alcohol (PVA) that allows dose visualization. This gel has high transparency and is clear at zero dose. In addition, the gel can be manufactured at low cost, easily, and safely in comparison with existing gel type dosimeters. In this study, we irradiated PVA-KI gels with X-rays from a generator and γ-rays from a Co-60 source, and evaluated the color changes on dose by absorbance using UV-VIS spectrophotometry. Additionally, we looked at the dose-rate dependence and energy dependence of the gel from results of irradiation with Xrays and γ-rays. The results showed that the gel has a linear response and repeatability when exposed to radiation and useful for visualization of dose distribution.
Research and Development of PVA-KI Gel Dosimeter
