Abstract
Three study areas of Kwanak campus (Seoul National University), Boeun (Choong‐buk) and Gapyung (Kyonggi) were selected and classified according to their bedrock types in order to investigate soil–gas radon concentrations. The mean values of radon concentrations decreased in the order of Gapyung (40 Bq L−1) > Kwanak campus (30 Bq L−1) > Boeun (22 Bq L−1), and decreased in the order of granite gneiss > banded gneiss > granite > black slate–shale > mica schist > shale–limestone > phyllite schist according to bed rock types. Variation in radon emanation with water content in soils and with soil grain size was assessed by the modified Morse (1976) 3 min method. Soil–gas radon concentrations increased with increasing water content in the range of less than about 6–16 wt. %, but decreased above 6–16 wt. %. Radon concentrations also increased with decreasing soil grain size. Radioactivity analysis of radionuclides of 238U series in some soil samples indicated their possible radioactive disequilibrium between 226Ra and 238U due to the differing geochemical behaviour of intermediate radionuclides. Thus, a radioactive isotope geochemical approach should be necessary for soil–gas radon study.
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