Fig. 1
From: Design and evaluation of electron beam energy degraders for breast boost irradiation
Construction of energy degrader. Construction of the energy degrader (ED) for 7 MeV beam investigated using the Monte Carlo simulations. The shape of ED was a truncated cone attached on the plane plate and the central thickness of ED was 1.0 cm. a A picture of the optimized energy degrader placed on the plane plate of the lowermost scraper for 10 × 10 cm2 cone. It was secured in the cutout insert. b The top view of ED; the parameter r is the radius of circle on the upper layer. c The side view of ED; T t is the thickness for upper layer and T b is the thickness of bottom layer. Ratio of two layer’s thickness varied with design-to-design