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. 2021 Jul 16;11:14578. doi: 10.1038/s41598-021-93983-2

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© The Author(s) 2021

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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Annual average radon and thoron concentrations in houses. (a) Distributions of ²²²Rn and ²²⁰Rn in the HNBRA. (b) Distributions of ²²²Rn and ²²⁰Rn in the NBRA. (c) Annual average ²²²Rn concentration in the study villages and control area. (d) Annual average ²²⁰Rn concentration in the study villages and control area. In (c,d) the horizontal black lines are the uncertainties. WHO²⁶ and ICRP²⁷ reference levels for indoor ²²²Rn activity concentration are 100 and 300 Bq m⁻³, respectively.