Energy dependence (75 kVp to 18 MV) of radiochromic films assessed using a real-time optical dosimeter.
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 for 60Co irradiation. 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 the 60Co beam over the entire energy range.
Rink
Alexandra
A
Princess Margaret Hospital/Ontario Cancer Institute, Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 2M9 Canada.
Vitkin
I Alex
IA
Jaffray
David A
DA
D003199:Computer Systems; D004307:Dose-Response Relationship, Radiation; D004735:Energy Transfer; D019544:Equipment Failure Analysis; D005373:Film Dosimetry / Q000295:instrumentation* / Q000379:methods*; D055095:Optics and Photonics / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity