Analysis of Post-exposure Density Growth in Radiochromic Film with Respect to the Radiation Dose

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  • SHIMA Katsumi
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University National Hospital Organization Hokkaido Cancer Center
  • TATEOKA Kunihiko
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • SAITOH Yuichi
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University National Hospital Organization Hokkaido Cancer Center
  • SUZUKI Junji
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • YAEGASHI Yuji
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • FUJIMOTO Kazunori
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • NAKAZAWA Takuya
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • NAKATA Akihiro
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • ABE Tadanori
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • IMAI Sho
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • SAKATA Kouichi
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University
  • HAREYAMA Masato
    Department of Radiation Oncology and Medical Physics, Graduate School of Medicine, Sapporo Medical University

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The post-exposure density growth (PEDG) is one of the characteristics of radiochromic film (RCF). In film dosimetry using RCF and a flatbed scanner, pixel values read out from the RCF are converted to dose (hereafter, film dose) by using a calibration curve. The aim of this study is to analyze the relationship between the pixel value read out from the RCF and the PEDG, and that between the film dose converted from the RCF and the PEDG. The film (GAFCHROMIC EBT) was irradiated with 10-MV X-rays in an ascending 11-dose-step arrangement. The pixel values of the irradiated EBT film were measured at arbitrary hours using an Epson flatbed scanner. In this study, the reference time was 24 h after irradiation, and all dose conversions from the pixel values read out from the EBT film were made using a calibration curve for 24 h after irradiation. For delivered doses of 33 and 348 cGy, the measured pixel values at 0.1 and 16 h after irradiation represented ranges of –9.6% to –0.7% and –3.9% to –0.3%, respectively, of the reference value. The relative changes between the pixel values read out from the EBT film at each elapsed time and that at the reference time decreased with increasing delivered dose. However, the difference range for all the film doses had a width of approximately –10% of the reference value at elapsed times from 0.1 to 16 h, and it showed no dependence on the delivered dose.

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