5.1.3. Penumbral width comparison between Kodak EDR2 radiographicand GafChromic®EBT2film
5.1.3.1. Calibration curves comparison
Figure5.1.4 (a-c) present the comparison of calibration curves between EDR2 radiographic film and EBT2 film for field size of 11, 22 and33 cm2with different depths. The EDR2 goes up less sharply than the EBT2 film when dose increases which means that it shows substantial less sensitivity to dose than EBT2 film. However their calibration curves show no field size and depth dependence, it might because of our ranges of filed sizes and depths still have less amount of low energies as mentioned by Robar and Clark.