ISSN : 1738-4125(Print)
ISSN : 2287-7509(Online)
ISSN : 2287-7509(Online)
GIS(지리정보시스템)를 이용한 서울시 지하역사의 라돈농도 평가
GIS Applications to Radon Concentration Assessment in Seoul Subway Stations
Received 16 November 2005, accepted 27 January 2006
Abstract
The objective of this study was to identify the primary source of radon in Seoul subway stations, and toinvestigate a relationship between geology and radon. Especially, we expected that the granite areas wouldhave substantially high levels of radon in subway stations. The indoor radon concentrations in subwaystations were lognormally distributed. The geometric mean and geometric standard deviation of indoor radonconcentration were 48.11 Bq/㎥ and 2.15, respectively. Indoor radon concentrations of eight measuring sitesexceeded U.S. EPA criteria (148 Bq/㎥). The geological structure of the subway station regions under thisstudy is characterized by biotite granite, alluvium, banded biotite gneiss and diluvium. Results indicate thatbedrock geology can account for a significant portion of the indoor radon in subway stations. Indoor radonconcentrations of one subway station were higher than those of other stations. The bed rock in thisparticular subway station was that of alluvium. We assumed that the unusual increase in measured radonconcentration should be related mainly to the existence of the near inferred fault zone (p<0.0001). Weselected ten subway stations with homogeneous bedrock type in order to compare radon concentrations ofeach basement level. There was a significant difference in radon concentration, depending on the basementlevels in subway stations (p<0.05).
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