Abstract: Based on the numerical calculation method on electromagnetic dosimetry and according to the typical electrostatic discharge (ESD) current waveform specified by IEC (International Electro technical Commission), the first harmonic component with the strongest energy and the full harmonic components in the frequency domain after Fourier transform were used as electromagnetic radiation sources, the electromagnetic effect of human biological tissue when the human body is located at different positions of the exposure source is simulated and analyzed, and the numerical simulation results were compared with those recommended by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The results showed that the electric field intensity (E), magnetic field intensity (H) and specific absorptivity (SAR) decreased with the distance from the exposure source, and the distribution of electric field lines became more uniform with the increasing distance; The electric field intensity attenuates rapidly after entering the head, and the brain has a certain shielding effect on the space electromagnetic field; The SAR peak values and distributions in coronal and sagittal planes are almost the same at different positions in the human head, and the SAR peak values in sagittal and coronal planes are 15.7 times of those in axial planes; The peak of head SAR at different positions appeared at the skull, and the SAR in the brain was the smallest and distributed symmetrically with respect to x and y; Under the condition of multi frequency exposure, the whole-body SAR value of the exposure source located at 1m (position A) on the right side of the human body exceeded the basic limit of ICNIRP, while the whole-body SAR value of the exposure source located at 5 m (position B) on the right side of the human body and beyond did not exceeded the basic limit of ICNIRP. The human body should be located 5 m away from the exposure source to reduce the exposure risk. The research results can provide a numerical reference for human ESD electromagnetic exposure protection, and can provide a theoretical basis for the formulation of ESD electromagnetic exposure related standards.

Key words: electrostatic discharge, spectrum analysis, COMSOL Multiphysics, electromagnetic radiation, safety assessment, ICNIRP