,Strategies for accurate response assessment of radiochromic film using flatbed scanner for beam qua

• 作 者: XuDong Zhang YuanHao Liu XiaoBin Tang MingChen Hsiao WeiLin Chen ChangRan Geng WenCheng Shao ChunHui Gong Silva Bortolussi DiYun Shu
• 机 构: Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Na
• 出 处: 核技术（英文版）
• 发表日期: 2019年11期
• 关键词: Radiochromic film Response assessment Scanning setting Interscan variability Sta

Radiochromic film is a useful tool for beam quality assurance, but accurate response assessment of the film is still a problem. In this study, the response uncer-tainties of HDV2 film were investigated using a fiatbed scanner from both the scanning settings and interscan variability. Scanning settings are fixed conditions for scanning, including scanning resolution and focus setting. In this study, multipeak distributions of pixel values were found under some dots-per-inch values, which should be avoided, and the optimal setting of 2000 dpi without this problem was selected. By changing the focus setting, the relative standard deviation of pixel values was reduced by 36–50%. The infiuence of the interscan variability induced by three factors was investigated, including the outside illumination intensity, film homogeneity, and operating temperature. Scanning the film before and after irradiation at the same position was recommended. Moreover, the suitable operating temperature range for the scanner was found to be 15–24°C, which results in stable film responses. Regarding the studied factors, correction meth-ods and strategies were proposed, and the accurate response assessment of HDV2 film was realized. Finally, a standard operating procedure for response assessment of films was introduced. It can help other researchers study more scanners, films, and particle types.