the Nonlinear Change of Complex Permittivity in Biochemical reaction

摘要

RF radiation exposure standards development has been ongoing for over 50 years. In general, RF radiation dosimetry is based upon the specific absorption rate (SAR). The SAR varies as a function of frequency, polarization, dielectric properties of the exposed biological tissue and geometry and orientation of the exposed object (1). It is difficult to measure the SAR distribution in a human body directly. Body model and numerical calculation are used to measure or compute the SAR(2). However, researchers usually assume the humane body as a non-uniform dissipating media, so dielectric properties don't vary with metabolism of the body. In fact, the human body is a complex organic system, and the metabolism of human body is performed through a series of biochemical reactions. It has not yet investigated if the dielectric properties remain te same during the biochemical reaction. So the SAR distribution calculated on such an assume is not appropriate. Comsequently, it is very significant to study the dielectric properties of biochemical reactions.