Characteristic of Gafchromic Film for Small Photon Field
نویسندگان
چکیده
Small photon field used in the intensity modulated radiotherapy (IMRT) and stereotactic radio surgery (SRS). It is difficult to measure beam profile and output factor because of electron disequilibrium, partial shutting of source because of this challenges, we need the good detector. This article is collection of 5 or more article and summary of the results of EBT3 that compared with EBT2 film and also they were compared with conventional dosimeter, ionization chamber and also examine the diametric accuracy of Gafchromic EBT3 for use in quality assurance. The results of these articles showed that the EBT3 films were excellent uniformity and similar darkening time amelioration as EBT2 films that a high uncertainty in readout of the film response was observed for samples irradiated with doses lower than 1 Gy. The side orientation sensitivity of former EBT2 films has been completely removed for EBT3 films because of the balance of configuration, though scanning orientation still has to be retained. It is possible to suggest the use of EBT3 film in conventional quality assurance testing for radiotherapy.
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