Human Safety for Exposures to Intermediate Frequency Electromagnetic Fields

Masao Taki

Photo.1 Masao Taki

Kenichi Yamazaki

Photo.2 Kenichi Yamazaki

Chiyoji Ohkubo

Photo.3 Chiyoji Ohkubo

Kanako Wake

Photo.4 Kanako Wake

Magnetic field sensor at intermediate frequency

Fig.1 Magnetic field sensor at intermediate frequency

Measurement example of magnetic field strength around the IH cooking hob

Fig.2 Measurement example of magnetic field strength around the IH cooking hob

Computational example of internal current density for exposure to the magnetic field from IH cooking hob

Fig.3 Computational example of internal current density for exposure to the magnetic field from IH cooking hob

 There had been increasing concern about adverse health effect due to electromagnetic fields from 1990s. Much attention has been paid to extremely low frequency (expecially at 50 and 60 Hz) or microwaves (GHz region). Almost no attention has been paid to the exposure safety from intermediate frequency fields. This group has developed small magentic sensor to measure the magnetic field stregnth with high accuracy and resolution for frequencies up to 100 kHz. Reconstruction algorithm for the magnetic source has been then developed from the measured field strength, which is essential for computer simulation. With the procedure developed, the internal electric field stregnth has been evaluated for the external field strength from products. The techniques has also been applied to the design of the exposure setup for animal experiments. From the measured results, no effect of intermediate frequency magnetic fields on DNA methylation has been found.

 IEEJ praised the achievement of this development and awarded Masao Taki(Tokyo Metropolitan University)、Kenichi Yamazaki(Central Research Institute of Electric Power Industry)、Chiyoji Ohkubo(Japan Electrical Safety & Environment Technology Laboratories)、Kanako Wake(National Institute of Information and Communications Technology) with prize of progress in 2016.

Publications

(1) K. Yamazaki, M. Taki, and C. Ohkubo, “Safety assessment of human exposure to intermediate frequency electromagnetic fields,” IEEJ Trans. Fundamentals and Material, vol.135, no.9, pp.500-506, 2015.
(2) M. Ikehata, S. Yoshie, K. Wada, Y. Suzuki, K. Wake, S. Nakasono, M. Taki, C. Ohkubo, “Evaluation of effects of intermediate frequency magnetic field on DNA methylation,” Proc. URSI General Assembly and Scientific Symposium, Aug. 2014.
(3) Health concern about electricity in our living life (new edition), IEEJ, Tokyo, Japan, 2010
(4) Y. Suzuki and M. Taki, “Measurement of magnetic field from an induction heating hob and estimation of induced current density in human body,” IEEJ Trans. Fundamentals and Material, vol.125, no.5, pp.427-433, 2005.
(5) K. Yamazaki, T. Kawamoto, H. Fujinami, and T. Shigemitsu, “Equivalent dipole moment method to characterize magnetic fields generated by electric appliances: extension to intermediate frequencies of up to 100 kHz,” IEEE Trans. Electromagnetic Compatibility, vol.46, no.1, pp.115-120, 2004.

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Electricity & Electric Power
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