KMID : 1039220190290020176
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Journal of Korean Society of Occupational and Environmental Hygiene 2019 Volume.29 No. 2 p.176 ~ p.184
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Characteristics of airborne radon and thoron levels monitored in Seoul Subway stations and circulation lines
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Kwak Hyun-Seok
Kim So-Yeon Park Ji-Hoon Choi Sang-Jun Park Dong-Uk
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Abstract
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Objective: This study aims to characterize airborne radon and thoron levels (Bq/m3) generated from working environments in three subway stations in Seoul.
Method: A radon and thoron detector (EQF3220) was used to monitor real-time airborne radon and thoron levels (Bq/m3) and their daughters (Bq/m3) every two hours. They were monitored not only in the driver¡¯s cabin of seven circulation lines, but also three offices, platforms, and water pump reservoirs in the three stations.
Results: The average levels of radon and thoron were 67.9 Bq/m3 (range; 7.2?619.4 Bq/m3) and 44.4 Bq/m3 (range; 4.3-819.2 Bq/m3), respectively. Notably, higher than legal airborne radon levels (600 Bq/m3) were frequently monitored in the driver¡¯s cabin of seven circulation lines. Airborne radon levels monitored in the platforms and administrative offices were found to be over 100 Bq/m3. The average equilibrium factors (F) were 0.12 and 0.06, respectively. The percentages detected were found to be 84.9 for radon and 72.4 for thoron, respectively.
Conclusions: Significant airborne radon and thoron levels were frequently found to be generated in subway facilities including water reservoirs, platforms and driver¡¯s cabins. Further study is necessary to thoroughly investigate airborne radon and thoron in all subway stations and to devise proper measures.
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KEYWORD
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indoor air, exposure, radon, subway, thoron
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