Abstract
In this work, a planar extrapolation chamber without an entrance window was used to measure surface dose rate to water from a flat 106Ru/106Rh plaque manufactured by Eckert & Ziegler BEBIG. Measurements with the flat source were performed as part of a larger aim to develop a convex windowless extrapolation chamber for determining surface dose rate from curved 106Ru/106Rh plaques. Monte Carlo corrections for backscatter and divergence in the chamber were generated with the EGSnrc cavity user code. Surface dose rate values from the extrapolation chamber were compared with un-laminated EBT3 film results based on a 60Co calibration. To determine surface dose using radiochromic film, an additional Monte Carlo correction was needed to account for phantom scatter and volume-averaging within the active layer for the on-contact measurement setup. Additionally, extrapolation chamber results for the flat plaque were compared with scintillation detector measurements performed by the manufacturer. The average surface dose rate from the extrapolation chamber was found to be 1.5% lower than the film measurement result and 8.0% lower than the manufacturer-provided source calibration. Based on the results, it was concluded that a windowless extrapolation chamber can be used as a primary measurement device to determine surface dose rate from a 106Ru/106Rh episcleral plaque, and radiochromic film measurements can also be carried out to serve as an accurate comparison.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
