Evaluation of an efficient calibration protocol for use in radiochromic film dosimetry for photon beams

This study aimed to investigate the adequacy of the response quantities and the calibration functions utilized in GafchromicTM film dosimetry. EBT3 GafchromicTM film pieces were irradiated to the deemed dose values between 0 and 3 Gy with the beam quality of 6 MV. Response quantities (net change in transmittance (net∆T) and net change in optic density (net∆OD)) were calculated. To determine whether the response quantities and different function forms were acceptable, they were tested using the dose uncertainty analysis techniques. An accurate and precise calibration protocol suggesting a new logarithmic functional form and its superior performance with use of netΔT was demonstrated.

Source: Radiation Physics and Chemistry - October 21, 2018 Category: Physics Source Type: research