Evaluation of Internal Electric Fields in Human Head Exposed to Non-uniform Magnetic Fields in the Vicinity of Power Lines

We evaluated internal electric fields in a human body exposed to non-uniform magnetic fields using a normalized induction factor, which is useful for determining compatibility with protection guidelines with respect to human exposure to magnetic fields. Assuming a situation in which the human head is placed in the vicinity of power lines, we calculated the internal electric fields in the brain tissue, head, and in the whole body exposed to non-uniform magnetic fields generated from a power line. Normalized induction factors, which convert the non-uniform magnetic field into an equivalent uniform magnetic field, were calculated for the internal electric fields and compared with the values obtained using an equation for evaluating normalized induction factor for a homogeneous sphere. The normalized induction factor was calculated to be smaller than that obtained using the evaluation equation for a homogeneous sphere with a radius of 0.2 m. It was confirmed that the evaluation equation for a homogeneous sphere with a radius of0.2m can be used to evaluate human exposure to non-uniform magnetic fields conservatively.