不同方形射野下用于6兆电子伏电子束剂量降低的铅屏蔽厚度

Lead shielding thickness for dose reduction of 6-MeV electrons for different square fields.

作者信息

Prasad S G, Parthasaradhi K, Arbetter S, Lee Y, Garces R

机构信息

Division of Medical Physics, Evanston Hospital, Northwestern University Medical School, Illinois 60201.

出版信息

Med Phys. 1988 Mar-Apr;15(2):263-6. doi: 10.1118/1.596257.

DOI:10.1118/1.596257

PMID:3386601

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.

摘要

测量了Varian Clinac 1800产生的6兆电子伏电子束在有和没有建成区情况下，通过铅（Pb）对6×6、10×10、15×15、20×20和25×25平方厘米射野的相对剂量减少百分比。将初级电子束强度衰减至95%和98%所需的铅厚度取决于射野大小以及在模体中进行透射测量的深度。