# An Assessment of the Impact of Gypsum Deposit Development on Changes in the Radiation Environment
## 4 Conclusions
The highest values of the ambient dose equivalent rate are associated with the locations of waste rock dumps, represented by a mixture of sandy-clayey deposits with gypsum fragments. Clayey deposits and soil contain a significant amount of radionuclides; therefore, the ADER intensity is directly related to the relative clay content in this mixture. However, these ADER values are significantly lower than the established effective dose level for quarry workers of 5 mSv yr\({}^{-1}\) and do not exceed 0.14 mSv yr\({}^{-1}\). They also comply with the requirements for selecting construction sites (\(\leq\)0.3 uSv h\({}^{-1}\)). The gypsum layers brought to the surface by mining operations in the quarry are a virtually impermeable screen that prevents radon from the earth's interior. Outside the quarry, the radon flux density in some areas does not comply with the requirements for selecting construction sites, \(\leq\)80 mBq (m\({}^{2}\)s)\({}^{-1}\). It reaches a value of 181 \(\pm\) 54 mBq (m\({}^{2}\)s)\({}^{-1}\) due to the fact that the soils have increased permeability and \({}^{226}\)Ra activity at a level of 26.8 \(\pm\) 4.04 Bq kg\({}^{-1}\). In the waste rock dumps in the quarry area, RFD, like the ADER, is directly related to the relative content of clay, loam, sand and gravel and has intermediate values. It is also necessary to pay special attention to the fact that caves are widespread in the study area. They are usually associated with zones of increased rock fracturing in which advective transfer is possible--a flow of radon in the volume of the moving gas phase. Such transfer is significantly higher than the diffusion transfer of radon from soils in an undisturbed state and requires separate study. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app15126639/s1](https://www.mdpi.com/article/10.3390/app15126639/s1)]([https://www.mdpi.com/article/10.3390/app15126639/s1](https://www.mdpi.com/article/10.3390/app15126639/s1)), Figure S1: Dependence of uranium concentration in water on Eh without taking into account two samples with the Ca-HCO\({}_{3}\)-SO\({}_{4}\) composition with minimum TDS values at the level of 0.1 g L\({}^{-1}\), Table S1: Descriptive statistics of the considered parameters of bottom sediments, Table S2: Contents of macro- and microelements in water samples (W) around the Gluokokoye gypsum deposit, Table S3: Distribution of elements in bottom sediments of rivers and lakes (BS) around the Gluokokoye gypsum deposit, mg kg\({}^{-1}\), Table S4: Correlation matrix of the main parameters characterizing the composition and properties of bottom sediments, Table S5: Distribution of ambient dose equivalent rate (ADER) around the Gluokokoye gypsum deposit, nSv h\({}^{-1}\), Text S1: Gamma spectrometric measurements, Text S2: Determination of the pH of the aqueous extract and the content of water-soluble salts, Text S3: Determination of the mass fraction of organic matter and carbonates. References [73; 74; 75; 76; 77] are cited in the supplementary materials. Conceptualization, A.I.M. ; methodology, A.I.M., V.A.N., S.V.D. and E.N.Z. ; software, V.A.N., S.V.D. and E.N.Z. ; validation, A.I.M. ; formal analysis, A.I.M. ; investigation, A.I.M., V.A.N., S.V.D. and E.N.Z. ; resources, V.A.N. ; data curation, A.I.M. ; writing--original draft preparation, A.I.M., V.A.N., S.V.D. and E.N.Z. ; writing--review and editing, A.I.M. ; visualization, A.I.M., V.A.N., S.V.D. and E.N.Z. ; supervision, A.I.M. ; project administration, A.I.M. All authors have read and agreed to the published version of the manuscript. This work was supported by the Ministry of Education and Science of Russia (FUUW-2025-0011, project No. 125022002727-2). Not applicable. Data Availability Statement: Data are available upon reasonable request from the corresponding author. The authors declare no conflicts of interest.