Choi Sangjun, Kim Soyeon, Bae Seoyoun, Kim Won, Park Ju-Hyun, Chung Eunkyo, Park Jihoon, Park Dong-Uk
Department of Occupational Health, Daegu Catholic University, Gyeongsan, Republic of Korea.
Department of Environmental Health, Korea National Open University, Seoul, Republic of Korea.
Bioelectromagnetics. 2019 Dec;40(8):569-577. doi: 10.1002/bem.22210. Epub 2019 Aug 2.
This study aims to assess the levels of extremely low frequency magnetic fields (ELF-MF) emitted from portable hand-held fans (HHFs) and their principal frequency and to identify factors influencing these levels. We collected a total of eleven models of HHF and monitored the ELF-MF as a function of fan speed and distance from the fan. EMDEX II was used to monitor the ELF-MF. An SMP2 EMF-meter equipped with a P400 field probe was used to determine the levels of ELF-MF and the frequency spectrum. Ten of the fans, excluding only one bladeless-fan model, emitted a high level of ELF-MF near the source of the HHF direct-current motor. The maximum measured level of ELF-MF ranged from 14.07 to 218.7 µT. All measurements of the ELF-MF taken within 10 cm from the HHFs showed values higher than 1.0 µT. ELF-MF levels were found to decrease markedly with distance, regardless of the HHF product. The level of ELF-MF rose noticeably with increased fan speed. The speed of and distance from the HHF significantly influenced the level of ELF-MF. All principal frequencies ranged from 1 to 300 Hz, which falls in the typical range of ELF. Bioelectromagnetics. 2019;40:569-577. © 2019 Bioelectromagnetics Society.
本研究旨在评估便携式手持风扇（HHF）发出的极低频磁场（ELF-MF）水平及其主要频率，并确定影响这些水平的因素。我们总共收集了11款HHF模型，并监测了ELF-MF随风扇速度和距风扇距离的变化情况。使用EMDEX II监测ELF-MF。配备P400场探头的SMP2电磁场仪用于测定ELF-MF水平和频谱。除一款无叶风扇模型外，其余10款风扇在HHF直流电机源附近发出高水平的ELF-MF。ELF-MF的最大测量水平在14.07至218.7µT之间。在距HHF 10厘米内进行的所有ELF-MF测量显示，其值均高于1.0µT。无论HHF产品如何，ELF-MF水平均随距离显著降低。ELF-MF水平随风扇速度增加而显著升高。HHF的速度和距离对ELF-MF水平有显著影响。所有主要频率范围为1至300Hz，属于ELF的典型范围。《生物电磁学》。2019年；40:569 - 577。©2019生物电磁学会。
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