title: Investigations on the near surface dose for three 10-MV x-ray beam accelerators with emphasis on the reduction of electron contamination.
abstract: A study of three 10-MV x-ray clinical accelerators with emphasis on the reduction of electron contamination was conducted. This study, which was performed with different types of trays and filters, suggests that, at 100-cm source-surface distance (SSD), Pb can be used as an effective filter material up to 30 X 30 cm2; however, due to its transparency, a Clear-Pb tray is useful for field sizes up to a 20 X 20 cm2. Percent depth doses for a few selected depths and field sizes at this nominal SSD were examined. No significant differences, with the exception of the location of Dmax, amongst the three accelerators were noticed.
authors.affiliation: Division of Medical Physics, Evanston Hospital, Northwestern University Medical School, Illinois 60201.
authors.forename: B M
authors.initials: BM
authors.lastname: Rao
authors.forename: S G
authors.initials: SG
authors.lastname: Prasad
authors.forename: K
authors.initials: K
authors.lastname: Parthasaradhi
authors.forename: Y
authors.initials: Y
authors.lastname: Lee
authors.forename: R
authors.initials: R
authors.lastname: Ruparel
authors.forename: R
authors.initials: R
authors.lastname: Garces
mesh_terms: D004583:Electrons; D006801:Humans; D010315:Particle Accelerators; D011878:Radiotherapy / Q000379:methods*; D014965:X-Rays