title: Lead shielding thickness for dose reduction of 5 MeV electrons.
abstract: The relative percent intensity reduction by lead (Pb) of 5 MeV electrons produced by Siemens Mevatron 77/74 for 5 cm diameter, 10 X 10, 15 X 15, and 20 X 20 cm2 cones both with and without buildup is measured. The thickness of lead (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: Y
authors.initials: Y
authors.lastname: Lee
authors.forename: R
authors.initials: R
authors.lastname: Garces
mesh_terms: D004583:Electrons; D006283:Health Physics; D006801:Humans; D007854:Lead; D011835:Radiation Protection / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy
chemical_list: D007854:Lead