Lead shielding thickness for dose reduction of 6-MeV electrons for different square fields.
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.
Prasad
S G
SG
Division of Medical Physics, Evanston Hospital, Northwestern University Medical School, Illinois 60201.
Parthasaradhi
K
K
Arbetter
S
S
Lee
Y
Y
Garces
R
R
D004583:Electrons; D006801:Humans; D007854:Lead; D008953:Models, Anatomic; D011835:Radiation Protection / Q000379:methods*; D011878:Radiotherapy / Q000379:methods*
D007854:Lead