Simplified Dosimetry for Human Exposure to Non-uniform ELF Magnetic Field

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Abstract

Regarding recent concerns on the health effects of ELF (extremely low frequency) magnetic fields, compliance testing in accordance with guidelines in highly non-uniform magnetic field has been a critical issue. In these cases, when the measured maximum magnetic fields on the surface of the human body exceed the reference level, the basic restriction should be investigated in a different way. However, this requires numerical calculation of the induced current or electric field, which is not readily achievable. Therefore, a simplified method for investigation of the conformity with a guideline, particularly one applicable to practical situations, is strongly required. In this paper, a new simplified method that can be used to estimate the maximum induced current from magnetic field measurements in practical complex situations was proposed. This method is based on the reduction rate of the magnetic field within a spherical model. The relationship between the reduction rate of magnetic field and the rate of maximum induced current to that of uniform field exposure was approximated using a simple regression curve. The previously proposed method based on averaging of the magnetic field over a certain area was also investigated. The results obtained in the study have practical values for assessing compliance with guidelines.

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