Effets des radiations electromagnetiques sur le corps humain

Abstract

The human body is more and more exposed to the electromagnetic pollution due to increasing usage of cellular phone and their antennes. Although the consequence of human health have not been clearly established. Few people know that when they use their cell phone, they undergo at the head, electromagnetic fields up to 50 or 100 Volts/m. The difference is that the radiation of the antenna is received weakly at the whole body, while the cellular phone radiates mainly the head with a much larger energy, most of the energy of this radiation is absorbed by the human body. This thesis is devoted to the modeling of transmission of electromagnetic energy througha biological medium (human head), Through observation of the dielectric properties of body tissue, their progres according to the variations of the GSM frequency (0.9 GHz and 1.8 GHz), solving Maxwell's equations to determine; expressions of electromagnetic fields in the human body and diffusing capacity of the energy (RF) in the layers of the human head most exposed to this radiation (skin, muscle, bone and brain), this by calculating the power absorbed by the tissues of the human head. Thereafter, we discuss in detail the superposition of incidentent electromagnetic radiation on the human body from mobile phones and their antennas on our biological system, and therefore our health. This by calculating: the total field absorbed by the human body, weaker link and SAR from by the antenna and mobile. And the evolution of thermal profiles of the human head, after exposure to an incident power, the evolution of the temperature in the human head is calculated using the bio-heatequation. We obtained good results highlight some constraints exposure conditions, in the presence of obstacles and features of the human body. Then a unified formulation is developed, and allows taking into account the simultaneous exposure to electromagnetic fields from mobile and antenna. We are certain that this amount of energy is absorbed by the human body.