Radiochromic polymer film dosimeters are strong candidates for radiation therapy dosimetry due to high spatial resolution, tissue-equivalency, relative ease of use, and the ability to provide two-dimensional measurement. In this work, we studied the growth kinetics of optical density of EBT3 and EBT-XD radiochromic film models, irradiated using megavoltage photon and proton therapy beams, over a period of 5 min to 120 hours post-irradiation.
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