Study on temperature dependent broadband frequency dielectric spectrum of SD rat muscle tissues

With the increasing recognition of threat of electromagnetic radiation to human health and environment, the study of electromagnetic biological effect has received wide attention. And the studies on dielectric properties of biological tissues play a key role on the electromagnetic biological effect to bio-dielectrics. In this work, the muscle tissues of SD rat have been studied by using the broadband dielectric spectrum in-vitro between the temperatures of 9°C-42°C at the frequency range of 1MHz-2GHz. We also do the dehydration rate experiment of muscle tissue in vitro, in order to explain the activity during testing time. The results indicate that all the measured muscle tissues show a single dielectric relaxation in the testing frequency range; as increasing the temperature for muscle tissues, the values of dielectric constant (real part) increase, and the peaks of dielectric constant (imaginary part) shift to higher frequency. According the Arrhenius formula and using piecewise fitting, we can obtain the activation energy for muscle tissue at multiple temperature ranges, and the relationship between the dielectric properties and biological activity is discussed. Meanwhile, it is shown that the results of dielectric constant at different frequencies and temperatures can provide necessary database for the study on the biological electromagnetic radiation effect.