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. 2022 Mar 25;12:5169. doi: 10.1038/s41598-022-09122-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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Study area, sample locations and distribution of indoor radon concentrations. (a) Study sites of eight provinces in upper northern Thailand, (b) Active fault zones in Thailand, (c) Seismic hazard map of Thailand, (d) Distribution of indoor radon concentration, with sampling points indicated in black dots using ArcMap software, Geostatistical wizard, Kriging method. Active fault zones in Thailand map and Seismic hazard map of Thailand obtained from the Department of Mineral Resources, Thailand (http://webeng.dmr.go.th/Show_Detail.aspx?DetailId=97).