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. 2016 Aug 31;11(1):112. doi: 10.1186/s13014-016-0686-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — 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