Dosimetric characteristics of gafchromic EBT3 film on small field electron beam

Abstract

This study was aimed to determine the dosimetry characteristics of the EBT3 film on a small field electron beam. The experiments were conducted using Linac Synergy-Platform with 6, 8, 10, 12, and 15 MeV. EBT3 films were cut into 3.2x2.5 cm2 in size and were irradiated with varied dose of 0 to 500 cGy on 1x1, 2x2, 3x3, 5x5, 8x8 and 10x10 cm2 radiation field sizes. The irradiated film was scanned using Epson Perfection V700 flatbed scanner to evaluate the pixel value. Then, the calibration curve was generated from netOD and given a dose. The uncertainty and sensitivity of the EBT3 film were evaluated using in-house and Image-J software to check the consistency of the result. The results showed that the largest uncertainty of characteristics curve was 4.6% at 1x1 cm2. Whereas the sensitivity value tends to be identical for radiation dose greater than 100 cGy for all energy, it depends on energy for radiation dose less than 100 cGy.