title: Lead shielding thickness for dose reduction of 6-MeV electrons for different square fields.
abstract: The relative percent dose reduction by lead (Pb) of 6-MeV electrons produced by Clinac 1800 for 6 X 6, 10 X 10, 15 X 15, 20 X 20, and 25 X 25 cm2 cones both with and without buildup is measured. The thickness of Pb required to attenuate the intensity of the primary electron beam to 95% and 98% depends upon the cone size and upon the depth in phantom at which transmission measurements are made.
authors.affiliation: Division of Medical Physics, Evanston Hospital, Northwestern University Medical School, Illinois 60201.
authors.forename: S G
authors.initials: SG
authors.lastname: Prasad
authors.forename: K
authors.initials: K
authors.lastname: Parthasaradhi
authors.forename: S
authors.initials: S
authors.lastname: Arbetter
authors.forename: Y
authors.initials: Y
authors.lastname: Lee
authors.forename: R
authors.initials: R
authors.lastname: Garces
mesh_terms: D004583:Electrons; D006801:Humans; D007854:Lead; D008953:Models, Anatomic; D011835:Radiation Protection / Q000379:methods*; D011878:Radiotherapy / Q000379:methods*
chemical_list: D007854:Lead