• Journal of Environmental Health Sciences
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• v.28 no.5
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• pp.71-76
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• 2002

A survey of radon concentrations in both indoor and outdoor atmospheres was carried out using EIRM and Cup Monitor for the period of February 1996 to March 1997. EIRM were used to measure the indoor and outdoor radon concentration at five major cities university. Cup Monitor were also used to measure the indoor radon concentrations at shopping store, office building, apartment, hospital and house in Seoul. The mean indoor and outdoor radon concentrations at the five major cities(Seoul, Daegu, Daejon, Cwangiu and Busan) were 24.1 Bq/m$^3$and 8.62 Bq/m$^3$, respectively. The ratio of indoor to outdoor radon concentrations ranged front 1.7 to 3.9. Inspection of its seasonal distribute pattern indicates the enhancement during winter relative to summer, consistently for both indoor and outdoor air. The results of the survey showed that the concentrations in basements were clearly higher than those in usual living/working places.

• Journal of environmental and Sanitary engineering
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• v.17 no.3
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• pp.75-82
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• 2002

This outline survey of indoor and outdoor radon concentrations in five major cities in Korea was carried out with Electrostatic Integrating Radon Monitor(EIRM) from February to December, 1996 and January to december, 1998. The mean indoor and outdoor radon concentrations in five major cities in 1996 were $21.9{\;}Bq/\textrm{m}^3$ and $9.6{\;}Bq/\textrm{m}^3$, respectively. The mean indoor and outdoor radon concentrations in 1998 were $20.8{\;}Bq/\textrm{m}^3$ and $9.0{\;}Bq/\textrm{m}^3$, respectively. These were below the U.S.EPA radon action level. The range of indoor to outdoor radon concentrations were $0.8{\;}Bq/\textrm{m}^3{\;}~{\;}45.6{\;}Bq/\textrm{m}^3$ in 1996, $0.5{\;}Bq/\textrm{m}^3{\;}~{\;}15.2{\;}Bq/\textrm{m}^3$ in 1998, respectively. The result of our analysis showed that radon concentrations in indoor air were clearly higher than those in outdoor air. Inspection of seasonal distribute pattern indicates the enhancement during winter relative to summer.