Browsing by Author "Wasana Silangam"

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    A study of important factors relating to the efficiency of roof ventilators
    (Mahidol University. Mahidol University Library and Knowledge Center, 2008) Wasana Silangam; Vichai Pruktharathikul
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    Exposure to extremely low frequency electromagnetic fields during lessons in secondary schools
    (2018-05-01) Wasana Silangam; Witaya Yoosook; Pornpimol Kongtip; Amarin Kongtawelert; Keson Theppeang; Mahidol University; Ministry of Labour
    © The Author(s) 2017. Published by Oxford University Press. All rights reserved. Schools are a significant location where children are exposed to electromagnetic fields (EMFs), which may cause adverse health effects. This cross-sectional study aimed to examine exposure levels to extremely low frequency magnetic fields (ELFMFs) with a range of 5Hz-32 kHz, and ELF-electric fields (ELF-EFs) with a range of 5Hz-2 kHz in secondary schools in Bangkok, Thailand. This study was conducted in 60 classrooms from three schools during class hours. Spot measurements were taken with a Narda EFA 300 field analyzer to evaluate exposure levels. This study showed that ELF-EMF exposure levels are lower than ICNIRP guidelines, while 21.67% of classrooms had a magnetic field strength above 0.2 μT, and the main sources of ELF-EMFs were electrical equipment and electrical wiring. Future studies should measure ELF-EMF levels in other areas and evaluate the effects of long term exposure to ELF-EMFs on children's health.