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. 2024 Jul 29;46(9):337. doi: 10.1007/s10653-024-02132-x

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© The Author(s) 2024

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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Fig. 5 — Differences in fits of mean annual measured values of radon concentration in workings of a former uranium mine in Kowary operating as a tourist route and radon inhalatorium to values estimated using quarterly correction factors k_3m recommended by Fijałkowska-Lichwa and Przylibski (4). Explanation: k_3ma—quarterly correction factor for naturally ventilated facilities, k_3mb quarterly correction factor for facilities with a mechanical ventilation system, k_3mc—averaged quarterly correction factor for all underground facilities. Three-month periods corresponded to four quarters of calendar year. Exposure: 1st quarter: from 2160 to 2856 h, 2nd quarter: from 1872 to 2208 h, 3rd quarter: from 2208 to 2616 h, 4th quarter: from 2208 to 2592 h, colours of legend and bars are the same, for bars used a colour blur