Abstract
This study aimed to establish an empirical relationship between the absorption spectrum of the EBT3 model GafChromic® film and absorbed radiation dose. Radiochromic films were irradiated with doses ranging from 1 Gy to 10 Gy using a Cobalt-60 Leksell Gamma Knife® Perfexion™ unit. Spectral analysis, conducted with the Agilent® Cary60 UV–Vis spectrometer 72 h post-irradiation, involved decomposing the net spectrum into nine Lorentzian components. Characteristic peaks remained stable within 5 nm, with the 583 nm and 635 nm absorption bands exhibiting a logistic response corresponding to the absorbed dose. Overall, the results present an empirical model showcasing dose-dependent spectrum evolution, emphasizing the potential of the ratio of two absorption band changes as a dose specifier. Furthermore, this spectroscopic approach provides key insights into radiation-induced optical changes in EBT3 films and facilitates the refinement of radiochromic film dosimetry.
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