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Lead shielding thickness for dose reduction of 5 MeV electrons
S G Prasad1, K Parthasaradhi, Y Lee
1Division of Medical Physics, Evanston Hospital, Northwestern University Medical School, Illinois 60201.
Medical Physics
|September 1, 1989
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.