# A Case Study of the Radon Hazard at the Boundary of a Coal Minefield
## 5 Conclusions  
In this study, the concentration of soil radon and its emanation to the surface were studied at the edge of a minefield, as well as areas within its vicinity. No significant correlation was found between soil VAR and RFD. The high radon concentrations in the soils of this area present a radiological hazard to the residential population, especially those with houses with underground levels. The high level of radon emanation makes it necessary to design high-quality ventilation systems in new and existing houses. The meteorological parameters, such as air temperature, pressure, and humidity, were correlated with RFD and VAR. In permeable rock zones, the importance of radon convection from deep layers of the Earth's crust increases, thus highlighting the significance of considering meteorological parameters. Special attention should be paid to underground coal mining areas and their surroundings in coal mining regions around the world. The regions over mines are radiologically dangerous areas due to the presence of radon-permeable zones created via the collapse of mine workings. The disturbance zone, which is often the boundary of coal deposits, can also have a high radiological impact. Radon flows through this area is facilitated via convection-diffusion. The source of radon may not only be exclusively from the disentangled rocks of the tectonic disturbance zone but could also come from mine workings. Air entering the weakened disturbance zone from the mine workings is a potential source of indoor radon that needs to be verified through field studies. The obtained values of radon concentration in soils and RFD allow us to conclude that this marginal part of the mine and its surroundings are at risk from radon.  
Currently, there is a lack of long-term observation monitoring or extensive preliminary studies into the radon hazard of soils near mine workings, including disturbance zones. These findings should be used to create temporary recommendations for the population to decrease exposure to radon until hazardous zones are identified and delineated. The primary approach to safeguarding homes in these regions uses forced ventilation of subterranean areas or their separation from primary residential zones. Additionally, increasing room ventilation is a crucial temporary measure, despite its limited effectiveness in the challenging winter climate of the research location. In the future, a key necessity for these regions is the establishment of a monitoring network aimed at assessing the characteristics of the radon field.  
**Author Contributions:** Conceptualization, T.L. and A.L.; methodology, T.L.; software, T.L.; validation, K.L., T.L. and A.L.; formal analysis, T.L. and A.L.; investigation, K.L., T.L. and A.L.; resources, T.L. and A.L.; data curation, T.L.; writing--original draft preparation, T.L. and A.L.; writing--review and editing, K.L., T.L. and A.L.; visualization, T.L.; supervision, T.L.; project administration, A.L.; funding acquisition, A.L. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was funded by the Russian Science Foundation (RSF) under research project \(N\) 23-27-00320, [[https://rscf.ru/en/project/23-27-00320/](https://rscf.ru/en/project/23-27-00320/)]([https://rscf.ru/en/project/23-27-00320/](https://rscf.ru/en/project/23-27-00320/)) (accessed on 31 October 2023).  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The data presented in this study are available in article.  
**Conflicts of Interest:** The authors declare no conflict of interest.