Abstract
The biological and health effects of electromagnetic fields are a current concern. With the aim of evaluating these effects, it is essential to estimate the levels of human exposure to various types of electromagnetic sources within different environments. These assessments could be performed by determining the current density distributions inside organs or tissues, by modeling the different mechanisms of electromagnetic exposure or even by modelling the development of effects in living beings. Everything should be done while considering various exposure scenarios. In this paper, we have determined, through simulations employing CST Suite Studio software, the specific absorption rates (SARs) values for a human body, averaged from the values for different 10 grams of tissue in different areas of the body, in the case of its exposure to an electromagnetic field generated by a source placed in the far field domain, where the human body is located in an empty room inside a building. We have used our previously tested 3D human body model that has the geometry of an elliptical cylinder. The simulated SAR values have been also compared with the reference levels accepted by the International Commission on Non-Ionizing Radiation Protection and IEEE Standards for Safety Levels for both public and professional exposure.
Highlights
OF OUR APPROACHFor real human being, the specific absorption rates (SARs) values will generally vary from those calculated using numerical methods applied to different simpler models of the human body
The results presented in this article are mainly related to SAR modelling and simulations; we refer to the 10 MHz– 10 GHz frequency range
Different numerical methods are used for SAR computations, but the most prominent numerical methods employed are Finite-difference time-domain (FDTD) and Finite integration technique (FIT)
Summary
The SAR values will generally vary from those calculated using numerical methods applied to different simpler models (sphere, cylinder and rotational ellipsoid) of the human body. As an entry point to the study of any type of human exposure to non-radiating EMFs, a simplified intermediary model could be accepted, as it would offer positive outcomes that could be considered in further approaches and developments. The EMF source was located outside the building, while the subject is inside an empty room with concrete walls located on the ground floor. The distance between the source and subject is higher than 5m; the incident wave is plane (for the whole spectrum of interest) and the set-up should be considered ‘far field’
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