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. 2019 Jul 25;9:10837. doi: 10.1038/s41598-019-46630-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Surface dose, dose at 15 cm and exit dose as a function of the distance from the central axis. The electron beam is focussed at 15 cm from the entrance of the water phantom for f/1.2 and f/11.5 and has energy of (a) 200 MeV and (b) 2 GeV. The dose is normalised to a single fraction of 2 Gy in the peak.