A Study on Distribution and Characteristics of Radon Concentration in Metro Line 1 in Busan

Abstract

Objective : Adverse health effects of Radon with a particular focus on indoor environment has been outlined. Most of the metro stations and platforms are situated under the ground where relatively enhanced concentration of radon has been observed.Method : On-line measurements of indoor Radon have been made in Metro Line 1 in Busan using RAD-7.Results and Discussion : The average concentration of Radon was 8.9 Bq/m³ (n=40). In general, a positive relation was shown between the level of radon and the depth of station. Slightly enhanced radon concentrations were observed between 0 a.m. ~ 5 a.m. when the station is closed under the non-operation of ventilation system. Interestingly, the negative relation was seen between the radon revel and temperature.Conclusions : Relatively low levels of indoor radon has been observed in Metro Line 1 in Busan, which may be associated with geographical location of non-granite regions.