| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1881490 | Radiation Measurements | 2012 | 8 Pages |
Superficial dose from 6- and 18-MV photon beams has been studied by measuring surface dose and shallow build-up dose using radiographic film EDR2, radiochromic film EBT2 and plane-parallel chamber. Measurements have been made for intensity- and non-intensity-modulated beams.The results show that the surface dose was found to be 19.8% and 10% of maximum dose in unmodulated fields for 6 and 18 MV photon beams, respectively. The study further showed that intensity modulation decreased surface dose by 1.1% and 0.7% for the same field size at 6 and 18 MV, respectively, and surface dose was dropped by magnetically sweeping contaminating electrons. EDR2 and EBT2 films show in good agreement in shallow build-up region.This study demonstrated the capability of EDR2 film, in addition to radiochromic film, to measure surface and build-up dose in case of treatment planning system uncertainties with regard to skin toxicity or shallow target coverage.
► The surface dose was found 19.8% of maximum dose in unmodulated field for 6 MV. ► It was 10% of maximum dose for 18 MV photon beams. ► Sweeping contaminated electron by dipole magnet reduced surface dose. ► EDR2 and EBT2 films measured dose in good agreement in build-up region. ► This study demonstrated the capability of EDR2 film to measure skin toxicity.
