Absorbed-dose energy dependence calculation relevant to EBT3, HD-V2, MD-V3, and RTQA2 Gafchromic films in electron...

Despite the nominally independent response of radiation dosimeters to beam energy within a given range, all types of dosimeters show a degree of energy dependence. Current study aims to evaluate the absorbed-dose energy dependence of certain Gafchromic films in electron fields through Monte Carlo (MC) simulation and analytical approaches. Four different film types including EBT3, HD-V2, MD-V3, and RTQA2 were considered. The MCNPX code was employed to simulate the absorbed-dose energy dependence of considered Gafchromic films inside a water-filled cylindrical phantom with a height of 30 cm and a radius of 20 cm. Furthermore, provided physical reference data by NIST were used for analytical evaluations of absorbed-dose energy dependence response. The energy dependence of selected Gafchromic films was calculated at different electron energies from 4 MeV to 20 MeV. The obtained results showed an energy dependence response for all studied films. Among the considered films, EBT3 and HD-V2 respectively, showed the least and the most absorbed-dose energy dependence in electron field. There was good agreement between the obtained results by MC simulation and analytical approach (with differences of less than 4 %). From the results, the observed energy dependence of studied Gafchromic films may be challenging for accurate dose measurements in electron fields. Furthermore, the agreement between Monte Carlo simulated and analytically determined f(Q) results indicates that Monte Carlo simulation can be employed as a reliable alternative to the analytical approach for evaluating the absorbed-dose energy dependence of Gafchromic films.