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17 February 2020 Optical spectral analysis of radiochromic films irradiated with radiation therapy beams
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Radiochromic films, owing to their high spatial resolution, are well-suited for radiation therapy dosimetry and quality assurance purposes. However, their spectroscopic response to radiotherapy beams has not been comprehensively investigated, except for a limited subset of beam qualities. In this work, we explore the spectral response of the EBT3 and EBT-XD radiochromic film models to different clinical radiation beam qualities including photons and protons. The spectral response of EBT3 and EBT-XD films showed two peaks at 585 nm and 635 nm for both photon and proton irradiation. Beyond a certain batch- and model-dependent dose threshold a saturation behavior was observed in the primary absorption peak. For beam qualities studied in this work, the spectral response of proton-irradiated films showed a systematic under-response compared to their photon-irradiated counterparts in both EBT-3 and EBTXD radiochromic films models.
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Arash Darafsheh, Tianyu Zhao, and Rao Khan "Optical spectral analysis of radiochromic films irradiated with radiation therapy beams", Proc. SPIE 11231, Design and Quality for Biomedical Technologies XIII, 112310I (17 February 2020);

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