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Lead shielding thickness for dose reduction of 6-MeV electrons for different square fields
S G Prasad1, K Parthasaradhi, S Arbetter
1Division of Medical Physics, Evanston Hospital, Northwestern University Medical School, Illinois 60201.
Medical Physics
|March 1, 1988
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.