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Energy dependence ( 75 kVp to 18 MV ) of radiochromic films assessed using a real‐time optical dosimeter
Author(s) -
Rink Alexandra,
Vitkin I. Alex,
Jaffray David A.
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2431425
Subject(s) - dosimeter , dosimetry , materials science , energy (signal processing) , optics , medical physics , physics , radiation , nuclear medicine , medicine , quantum mechanics
The response of radiochromic film, GafChromic ™ EBT, was investigated for dependence on x‐ray beam energy using a previously reported real‐time optical readout approach. X‐ray beams of energy from 75 kVp to 18 MV were employed. The dose‐induced change in optical density for the EBT film was compared to values obtained for GafChromic ™ HS and MD‐55 films, exposed under the same conditions. All responses were normalized to that obtained forCo60irradiation. While change in optical density for 1 Gy of applied dose as measured with HS and MD‐55 films decreased by approximately 40% at low energies, the mean change in optical density of EBT film remained within 3% of that in theCo60beam over the entire energy range.