中学课堂期间暴露于极低频电磁场

EXPOSURE TO EXTREMELY LOW FREQUENCY ELECTROMAGNETIC FIELDS DURING LESSONS IN SECONDARY SCHOOLS.

作者信息

Silangam Wasana, Yoosook Witaya, Kongtip Pornpimol, Kongtawelert Amarin, Theppeang Keson

机构信息

Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, Bangkok, Thailand.

Department of Labour Protection and Welfare, Ministry of Labour, Bangkok, Thailand.

出版信息

Radiat Prot Dosimetry. 2018 May 1;179(3):248-252. doi: 10.1093/rpd/ncx266.

DOI:10.1093/rpd/ncx266

PMID:29216404

Abstract

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 (ELF-MFs) with a range of 5 Hz-32 kHz, and ELF-electric fields (ELF-EFs) with a range of 5 Hz-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.

摘要

学校是儿童接触电磁场（EMF）的重要场所，而电磁场可能会对健康产生不良影响。这项横断面研究旨在检测泰国曼谷中学中5赫兹至32千赫兹范围内的极低频磁场（ELF-MF）以及5赫兹至2千赫兹范围内的极低频电场（ELF-EF）的暴露水平。本研究在上课期间对三所学校的60间教室进行。使用Narda EFA 300场强分析仪进行现场测量以评估暴露水平。该研究表明，极低频磁场暴露水平低于国际非电离辐射防护委员会（ICNIRP）的指导标准，然而，21.67%的教室磁场强度高于0.2微特斯拉，极低频磁场的主要来源是电气设备和电线。未来的研究应测量其他区域的极低频磁场水平，并评估长期暴露于极低频磁场对儿童健康的影响。