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- W2950965002 abstract "It is important to study absorption spectrum in film dosimetry because the spectral absorbance of the film relates to the film's total absorption dose. We investigated the absorption spectra of Gafchromic EBT2 film with various rotational angles in a visible wavelength band. The film was irradiated with 6 MV photon beams and a total dose of 300 cGy. Absorption spectra were taken under different rotational angles after 24 h after irradiation and we fitted the spectra using Lorentzian functions. There were two dominant absorption peaks at approximately 586 nm (green) and 634 nm (red). The measured spectrum was decomposed 542 nm, 558 nm, 578 nm, 586 nm, 626 nm, 634 nm, and 641 nm. The maximum total area of the red band absorption spectrum was at 45{deg}(225{deg}) and the minimum at 90{deg}(270{deg}). As the angle of rotation changed, the intensity and integrated area of the blue and green peaks also changed with 180{deg} period, with minima at 90{deg} and 270{deg}, and maxima at 0{deg} and 180{deg}, although the overall absorbance is very low. The spectral peak wavelengths remained constant within 2.4 nm for all angles. There was no hysteresis of absorption spectrum of the film; spectra taken at 0{deg} and 360{deg}were substantially the same and showed similar behavior for all rotational angles. The change of absorbance with rotational angle of the film affected the dosimetric properties, resulting in rotationalvariations of film dosimetry in each red-green-blue channel." @default.
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- W2950965002 date "2015-03-12" @default.
- W2950965002 modified "2023-09-27" @default.
- W2950965002 title "Absorption spectrum of Gafchromic EBT2 film with angular rotation" @default.
- W2950965002 hasPublicationYear "2015" @default.
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