Measurement of Radiation Abutment Dose for 6MV Photon and 9 MeV Electron Beam Combinations by GAFCHROMIC EBT3 Film at Extended SSD
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2017, Vol 5, Issue 5
Abstract
To measure the radiation abutment dose for 6 mega voltage (MV) photon and 9 mega electron volt (MeV) electron beam combinations by gafchromic EBT3 film at extended source to skin distance (SSD). A point dose measurement was done to calculate monitor for delivering 100 cGy dose at 3cm depth in RW3 solid water phantom for 9 MeV electron beam. for 110 cm and 120 cm SSDseparately . Monitoring units (MU) were calculate to deliver a point dose of 50 cGy at 6 cm depth by 6 MV asymmetric beam. Plans were delivered separately on RW3 solid water phantom having gafchromic EBT3 film strips placed at 1, 2 and 3 cm depths. Followed by generating the calibration curve for EBT3 gafchromicfim, profiles at the abutment regions were analyzed by dosimetry software (FimQa pro, version 3.0, Ashland, USA). The value of hot spot and cold spot has increased with increasing electron beam SSD from 110 cm to 120 cm. Maximum value of hot spot for 110 and 120 cm SSD was 141.6% and 146.235 respectively at 2 cm depth whereas maximum value of the cold spot was 76.24% and 72.8% at 3 cm depth. Measurement of the abutment dose in extended SSD of electron beam needs to be evaluated for the adequate dose delivery to the patients in head and cancer as significant hot and cold spot has been observed.
Authors and Affiliations
Vinod Pandey, Lalan Prasad, Kailash Chandra Pandey
Keywords
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