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. 2022 Mar 8;12:3761. doi: 10.1038/s41598-022-07653-y

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Judgment of the causative radiation type based on γ-H2AX foci size distribution by three criteria: (a) the average size of foci, (b) the percentage of foci that belong to two smallest groups and (c) the ratio of the number of foci per cell in the smallest group to that in the fourth smallest group. Three criterion values from alpha particle (black filled squares) and X-ray (red filled circles) exposures for each of 16 BEAS-2B (a-1,b-1,c-1) and 16 SVEC4-10EHR1 (a-2,b-2,c-2) test samples are displayed in contrast to the reference values (black and red lines for alpha particle and X-ray exposures, respectively). Arrows point to wrong judgments.