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• W2091378676 startingPage "2871" @default.
• W2091378676 abstract "There is a growing interest in Gafchromic® films for patient dosimetry in radiotherapy and in radiology. A new model (XR-QA) with high sensitivity to low dose was tested in this study. The response of the film to different x-ray beam energies (range 28–145 kVp with various filtrations, dose range 0–100 mGy) and to visible light was investigated, together with the after exposure darkening properties. Exposed films were digitized with a commercially available, optical flatbed scanner. A single functional form for dose versus net pixel value variation has been determined for all the obtained calibration curves, with a unique fit parameter different for each of the used x-ray beams. The film response was dependent on beam energy, with higher colour variations for the beams in the range 80–140 kVp. Different sources of uncertainties in dose measurements, governed by the digitalization process, the film response uniformity and the calibration curve fit procedure, have been considered. The overall one-sigma dose measurement uncertainty depended on the beam energy and decreased with increasing absorbed dose. For doses above 10 mGy and beam energies in the range 80–140 kVp the total uncertainty was less than 5%, whereas for the 28 kVp beam the total uncertainty at 10 mGy was about 10%. The post-exposure colour variation was not negligible in the first 24 h after the exposure, with a consequent increase in the calculated dose of about 10%. Results of the analysis of the sensitivity to visible light indicated that a short exposure of this film to ambient and scanner light during the measurements will not have a significant impact on the radiation dosimetry." @default.
• W2091378676 created "2016-06-24" @default.
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• W2091378676 date "2006-05-24" @default.
• W2091378676 modified "2023-10-18" @default.
• W2091378676 title "Dose and energy dependence of response of Gafchromic® XR-QA film for kilovoltage x-ray beams" @default.
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• W2091378676 doi "https://doi.org/10.1088/0031-9155/51/11/013" @default.
• W2091378676 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16723772" @default.
• W2091378676 hasPublicationYear "2006" @default.
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