Journal of Medical Physics (Jan 2016)

Simplified method for creating a density-absorbed dose calibration curve for the low dose range from Gafchromic EBT3 film

  • Tatsuhiro Gotanda,
  • Toshizo Katsuda,
  • Rumi Gotanda,
  • Tadao Kuwano,
  • Takuya Akagawa,
  • Nobuyoshi Tanki,
  • Akihiko Tabuchi,
  • Tetsunori Shimono,
  • Yasuyuki Kawaji

DOI
https://doi.org/10.4103/0971-6203.195192
Journal volume & issue
Vol. 41, no. 4
pp. 266 – 270

Abstract

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Radiochromic film dosimeters have a disadvantage in comparison with an ionization chamber in that the dosimetry process is time-consuming for creating a density-absorbed dose calibration curve. The purpose of this study was the development of a simplified method of creating a density-absorbed dose calibration curve from radiochromic film within a short time. This simplified method was performed using Gafchromic EBT3 film with a low energy dependence and step-shaped Al filter. The simplified method was compared with the standard method. The density-absorbed dose calibration curves created using the simplified and standard methods exhibited approximately similar straight lines, and the gradients of the density-absorbed dose calibration curves were −32.336 and −33.746, respectively. The simplified method can obtain calibration curves within a much shorter time compared to the standard method. It is considered that the simplified method for EBT3 film offers a more time-efficient means of determining the density-absorbed dose calibration curve within a low absorbed dose range such as the diagnostic range.

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