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A percentage distribution of the different rocks in Bulgaria with expected radon potential: 1, granites and granitoids; 2, gneiss and meta-granitoids; 3, shales; 4, sandstones; 5, carbonate sediments; 6, Cenozoic (Neogene and Quaternary) unconsolidated and semi-consolidated siliciclastic rocks. Note: * Rock types where high-level of geogenic radon potential is not being expected; ** Rock types with expected high-level of geogenic radon potential.
Source publication
Natural radon (222Rn) is a radioactive noble gas that occurs in every rock or soil due to the content of radium (226Ra), part of the 238U family, in the lithosphere. One of the indicators for evaluating the impact of radon on a certain area/terrain, including on the biota, is the so-called geogenic radon potential. Different types of rocks and soil...
Contexts in source publication
Context 1
... addition to the above-mentioned review, a GIS-based analysis on the spatial distribution (as a percentage of absolute territory occupation) of the rock types with expected geogenic radon potential done by Antonov et al. (2020) was performed ( Fig. 1). That was made in order to relate the future geogenic radon potential assessment with the further analysis of the shallow groundwater spatial distribution and ...
Context 2
... above data, the spatial distribution of the shallow groundwater is shown as locations over the territory of Bulgaria (Fig. 2) and as area of occupation of the rock`s andsoiìs territories with expected geogenic radon potential (Table 1). The latter represents the area of each rock and soil type with expected geogenic radon potential in regards to Fig. 1 analysis, and their area covered by the shallow groundwater, respectively (the last column). Thus in the latter areas, the future investigations of the geogenic radon potential could not be performed properly due to the influence of the pore water saturation. Especially, that is valid for areas of alluvial deposits (Fig. 2) where about ...
Context 3
... geogenic radon potential at a distinct area is affected by the geological settings as a content of uranium and also by the hydrogeological settings as Table 1 Shallow groundwater area of occupation in respect of the rockʼs and soilʼs areas with expected radon potential Note: indexes are according to Fig. 1ʼs legend Забележка: индексите са съгласно легендата на фиг. ...
Context 4
... addition to the above-mentioned review, a GIS-based analysis on the spatial distribution (as a percentage of absolute territory occupation) of the rock types with expected geogenic radon potential done by Antonov et al. (2020) was performed ( Fig. 1). That was made in order to relate the future geogenic radon potential assessment with the further analysis of the shallow groundwater spatial distribution and ...
Context 5
... above data, the spatial distribution of the shallow groundwater is shown as locations over the territory of Bulgaria (Fig. 2) and as area of occupation of the rock`s andsoiìs territories with expected geogenic radon potential (Table 1). The latter represents the area of each rock and soil type with expected geogenic radon potential in regards to Fig. 1 analysis, and their area covered by the shallow groundwater, respectively (the last column). Thus in the latter areas, the future investigations of the geogenic radon potential could not be performed properly due to the influence of the pore water saturation. Especially, that is valid for areas of alluvial deposits (Fig. 2) where about ...
Context 6
... geogenic radon potential at a distinct area is affected by the geological settings as a content of uranium and also by the hydrogeological settings as Table 1 Shallow groundwater area of occupation in respect of the rockʼs and soilʼs areas with expected radon potential Note: indexes are according to Fig. 1ʼs legend Забележка: индексите са съгласно легендата на фиг. ...
Citations
... In the publications titled "Impact of the Geological and Hydrogeological Settings on the Radon Potential in Bulgaria" (Antonov et al., 2022) and "Impact of the Loess' Hydraulic Characteristics on its Degree of Saturation for the Purpose of Radon Index Measurements (A Northeast Bulgaria Case Study)" , factors and parameters influencing the degree of saturation, particularly in the subsurface have been collected and analyzed. ...
... Fig. 1. Location of the of the shallow groundwater in Bulgaria with respect to the rock types with expected radon potential: 1 -granites and granitoids; 2 -gneiss and meta-granitoids; 3 -shales; 4 -sandstones; 5 -carbonate sediments; 6 -Cenozoic (Neogene and Quaternary) unconsolidated and semi-consolidated siliciclastic rocks; 7 -shallow groundwater bodies; 8 -in situ uranium ore deposits; 9 -surficial deposits (according to Antonov et al., 2022). between 0.25 (case study D) and 0.30 (case study C) vs OP 105 cm's 0.31 (case study D) and 0.35 (case study C) but on 25th of March it is always above both of them (Fig. 2). ...
... Table 1. Shallow groundwater area of occupation in respect of the rockʼs and soilʼs areas with expected radon potential (according to Antonov et al., 2022 Trayanova et al., 2022). ...
Radon (222Rn) is a radioactive gas formed as a result of the radioactive decay of radium (226Ra). Radon is identified as one of the dominant sources of population exposure that could lead to lung cancer, accounting for between 3% and 14% of all lung cancers. Rocks in the Earth’s crust are a primary source of radon in the atmosphere. In this context, the geogenic radon potential (GRP) of a terrain refers to the probability of high radon concentrations being present in a building. The radon index is a concept used to characterize the geogenic potential of the terrain, providing the likelihood of radon concentration in a building, which is directly related to the influence of the Earth's surface. One approach to quantifying the radon index is based on multivariate cross-tabulation, involving two parameters: radon concentration in soil gas and the gas permeability of the earth layer, both measured at 80 cm below the surface. In Bulgaria, focused investigations on the connection between radon gas and geology, resp. on GRP have begun in the last five. As a result of the accumulated experience from field studies conducted so far related to the characterization of GRP, two important aspects have been identified that impact field measurements and the determination of radon gas in the soil, thus the methodology for calculating the radon index. The first aspect is connected with the theoretical and model-based investigations about possible state of soil saturation. The second aspect is about the GRP and fault systems in Sofia. This article makes an attempt to summarize all the studies concerning these two aspects and to suggest some further steps in the geogenic radon potential studies.
