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KMID : 1039220190290020185
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Journal of Korean Society of Occupational and Environmental Hygiene
2019 Volume.29 No. 2 p.185 ~ p.194
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Evaluation of Intensity of Extremely Low Frequency Magnetic Fields (ELF-MF) Inside of Cabins as Generated During Subway Operation
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Lee Ji-Hyun
Kang Myeong-Ji
Park Yun-Kyung
Park Dong-Uk
Choi Sang-Jun
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Abstract
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Objective: This study was conducted to investigate the intensity of the extremely low frequency magnetic fields(ELF-MF) generated inside of the cabins during subway operation.
Methods: The ELF-MF intensity were investigated on 30 subway lines in Korea, including in the Greater Seoul Metropolitan Area(Seoul and Gyeonggi-do Province), Incheon, Busan, Daegu, Daejeon, and Gwangju. ELF-MF intensity was measured at 0.9 m from the floor using EMDEX II meters with a resolution of 0.01 μT. All data were collected every three seconds and analyzed with EMCALC 2013 version 3.0B software. Basic characteristics of subway operation, including alternative current(AC) or direct current(DC), voltage level, and opening year of the line were investigated. Real-time information during measurement, such as the time of departure, moving and arrival of trains, were also recorded.
Results: The arithmetic mean(AM) and maximum(Max) intensity of ELF-MF were 0.62 μT and 11.51 μT, respectively. Compared by region, the ELF-MF intensity measured inside cabin were the highest in the Seoul Metropolitan Area(AM=0.80 μT), followed by Busan(AM=0.30 μT), Daegu(AM=0.29 μT), Incheon(AM=0.14 μT), Gwangju(AM=0.04 μT) and Daejeon(AM=0.03 μT). The average ELF-MF level measured in AC trains(AM=1.36 μT) was also significantly higher than in DC trains(AM=0.28 μT). In terms of the opening year of the subway, trains opened before 1990(AM=0.85 μT) was the highest and the lowest was 2000-2009(AM=0.24 μT).
Conclusions: The AC supply has the greatest influence on the generation of the ELF-MF intensity in subway cabins.
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KEYWORD
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alternative current, ELF-MF, subway
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