Equivalent Permittivity Based on Debye Model of Blood and Its SAR

Li Gun

doi:10.11648/j.ijsts.20170503.12

Abstract

Dielectric parameters vary with frequencies are important properties of biological systems, which determine the absorption rates of electromagnetic radiation in human body. Two phase dielectric model is considered to investigate the dielectric properties of human blood in this paper. This paper systematically calculates the body's specific absorption rate of electromagnetic fields at low frequencies based on the dielectric properties obtained from the Debye model. This study could lay foundation not only for the theoretical basis for further study on electrical properties of biological tissue, but also for the exposure limits of health standard on electromagnetic radiation.

Highlights

Blood, as a fundamental part of the immune system and one of the functional tissues, can deliver oxygen and nutrition to the vital parts in body
The applicability and potential application value of the model are discussed with Specific Absorption Rate (SAR) of blood tissue as an example
This formula denotes that the Specific absorption rate of electromagnetic power by unit mass of human tissue, the SAR

Summary

Introduction

As a fundamental part of the immune system and one of the functional tissues, can deliver oxygen and nutrition to the vital parts in body. The precise knowledge of the dielectric properties of blood is prerequisite for fixing limiting values for electromagnetic pollution [1]. Blood cells are unevenly distributed in the blood plasma, and the polarization direction will change when the external electrical field changes. Many scholars put forward some classical formula for calculating equivalent permittivity of the two-phase, three-phase or even multi-phase composite based on the experimental data. These classic methods are subject to many restrictions, each theory can only be successfully applied to a certain type of composite media. The applicability and potential application value of the model are discussed with Specific Absorption Rate (SAR) of blood tissue as an example

Model and Calculation Method of Dielectric Property in Blood

Application of Equivalent Permittivity in Blood

Conclusions