The Human Head Skull Role as Our First Thermoregulatory Natural Shield to Excessive Electromagnetic Fields at 1800 MHz

Abstract

In this article, we provide concluding evidence that the human head skull acts as a first dynamic barrier to excessive electromagnetic fields (EMFs) and temperature flow at 1800 MHz. This natural barrier is designed to effectively and dynamically protect brain tissue against safety-defined threshold temperature increases due to external EMF induction. A half-wavelength dipole antenna has been employed as the EMF source. The human head is modeled by several coronal planes extracted from the Visible Human Project and combined to the exposure of a 0.45λ-apart dipole and to heat transfer equations to accommodate for the human thermoregulatory response. The results described in this study are of great importance regarding whether thermal effects should be directly used to derive basic restrictions to EM field safety limits for human exposure. Since this study is limited to conditions under vasomotor adjustment, very excessive EMF induction may break this first natural barrier and produce excessive thermal stress, making the barrier incapable of maintaining thermal conditions on the human brain under control. This study is also limited to using a frequency of 1800 MHz.