On the spectral characterization of radiochromic films irradiated with clinical proton beams.

Radiochromic films have been widely studied for clinical dosimetry in conventional external beam radiation therapy. With an increase in practice of proton therapy, such films are being conveniently used; however, their spectroscopic characterization for this modality is lacking. This work investigated the response of the EBT3 radiochromic films irradiated in a Mevion S250 clinical proton beam.

Spectral analysis of the EBT3 radiochromic films for clinical photon and electron beams.

Purpose: The purpose of this study was to investigate the spectral response of the EBT3 radiochromic films to different beam qualities for radiation therapy dosimetry. Dose, dose rate, and interbatch dependencies on the spectral response of the films were investigated as well.

Methods: Pieces of EBT3 films placed between layers of solid water phantoms were irradiated with 6 and 15 MV photon beams, 6 and 10 MV-flattening filter free (FFF) photon beams, and 6 and 20 MeV electron beams at dose levels between 0.