An outline survey of indoor and outdoor
222Rn concentrations in South Korea was carried out with electrostatic integrating
222Rn monitors (EIRM) from Sept. 1995 to Feb. 1997. The annual mean indoor and outdoor
222Rn concentrations at the six central cities across Korea were 26.1Bq·m
-3 and 9.0Bq·m
-3, respectively. The outdoor
222Rn concentrations in seashore areas were lower than those of inland areas. Relatively high outdoor
222Rn concentrations were found at the inland cities in Korea, which may be explained as the geological structure. The ratios of indoor to outdoor
222Rn concentrations ranged from 1.6 to 3.8 with an average of 2.9. The seasonal pattern seems to be relatively high during spring to summer and relatively low during autumn to winter for both indoor and outdoor
222Rn concentrations. Passive integrating
222Rn cup monitors were also used to measure the indoor
222Rn concentrations at Seoul. The results showed that the concentrations in basements were clearly higher than those in usual living/working places, and the averages were 43.8Bq·m
-3 and 24.2Bq·m
-3, respectively.
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