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곽현석,김소연,박지훈,최상준,박동욱 한국산업보건학회 2019 한국산업보건학회지 Vol.29 No.2
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.
서울 일부 지하철 승무원석의 PM, 이산화탄소, 일산화탄소 모니터링에 의한 실내 공기질 특성 평가
곽현석,진구원,김원,양원수,최상준,박동욱,Kwag, Hyun-Suk,Jin, Ku-Won,Kim, Won,Yang, Won-Su,Choi, Sang-Jun,Park, Dong-Uk 한국환경보건학회 2005 한국환경보건학회지 Vol.31 No.5
[ $PM_{10},\;PM_{2.5},\;CO_2\;and\;CO$ ] in driver cabins of subway line from 5 to 8 were monitored from 07:00 through 21:00 (or 19:30 or 20:00) on May. Driver cabin of subway line 7 showed the highest $PM_{10},\;PM_{2.5},\;CO_2\;and\;CO$ concentrations. General Linear Model indicated that subway line, subway location (ground and underground track) and running time (morning and afternoon) significantly influenced the concentrations of $PM_{10},\;PM_{2.5},\;CO_2\;and\;CO$ (p=0.000). Daily profile of $PM_{10},\;PM_{2.5},\;CO_2\;and\;CO$, expressed as an 30 minutes average, showed similar variation pattern over day period. These concentrations showed the highest concentrations between 07:00 and 09:00 of rush hour, slightly dropped and again rose slightly after 18:00. In correlation analysis, significant relations among $PM_{10},\;PM_{2.5},\;CO_2\;and\;CO$ were detected (p<0.01). In particular, correlation coefficient between $PM_{10}\;and\;PM_{2.5}$ was highly significant (r=0.884). Regression analysis also concluded that $PM_{10}$ concentration significantly explained 71.4% of variation of $PM_{2.5}$ concentration (p=0.000, $R^2=0.714$). Correlations by CO with $PM_{10}\;and\;PM_{2.5}$ were 0.451 and 0.520, which were higher than those by $CO_2$. Further study is needed to examine the sources of $PM_{2.5}$ and CO in subway and to compare pollutants concentration among subway lines.