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J Med Signals Sens. 2019 Aug 29;9(3):204-210. doi: 10.4103/jmss.JMSS_45_18. eCollection 2019 Jul-Sep.

Evaluation of Dose Rate and Photon Energy Dependence of Gafchromic EBT3 Film Irradiating with 6 MV and Co-60 Photon Beams.

Author information

1
Department of Radiology Technology, Faculty of Paramedical Sciences, Babol University of Medical Sciences, Babol, Iran.
2
Department of Medical Radiation, Science and Research Branch, Islamic Azad University, Tehran, Iran.
3
Department of Medical Physics Radiobiology and Radiation Protection, Babol University of Medical Sciences, Babol, Iran.
4
Department of Medical Physics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
5
Department of Medical Physics, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
6
Departments of Medical Physics and Radiology, Faculty of Paramedical Sciences, Kashan University of Medical Sciences, Kashan, Iran.
7
Department of Medical Physics and Medical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
8
Department of Radiation Sciences, Yasuj University of Medical Sciences, Yasuj, Iran.

Abstract

Gafchromic films are utilized for two-dimensional dose distribution measurements, especially in radiotherapy. In this study, we investigated a close connection between energy and dose rate of Gafchromic EBT3 films irradiating with 6 MV and Co-60 photon beams over a broad dose range. EBT3 films were exposed to 6 MV and Co-60 photon beams using 4 and 2 Gy/min dose rates over a 10-400 cGy dose range. The films were scanned in red, green, and blue channels to obtain the optical density (OD)-dose curves. The OD-dose curves resulted from three-color scans for different photon energies and dose rates were compared by statistical independent t-test. For the radiations of Co-60 and 6 MV photon beams, the highest correlation was obtained between the 2 and 4 Gy/min dose rates with red and green channels, respectively. Moreover, the red channel had a greater OD response per dose value, following the green and blue channels. There was no significant difference between different photon energies' (Co-60 and 6 MV) and dose rates' (2 and 4 Gy/min) dependence on OD-dose response of EBT3 films over a broad domain of radiation dose, except for different photon energies in the blue channel. Our results revealed that the OD-dose response of EBT3 films is independent on photon energies (Co-60 and 6 MV) and dose rate (2 and 4 Gy/min) in the evaluated dose range (10-400 cGy). Therefore, the EBT3 films are suitable, consistent, and reliable instruments for dose measurements in radiotherapy.

KEYWORDS:

Dose rate response; EBT3 films; dosimetry; energy dependence; radiotherapy

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