Abstract

The previous studies of our research group, as well as the available literatures announced to the serious biological effects caused by the man-made visible light. Electromagnetic radiation (EMR) from man made linear source light (LSL) and the associated absorbed power in the biological cells is calculated. The finite difference time domain (FDTD) method estimations have been performed to investigate the intensity dependence of the specific energy absorption rate (SAR) in the specific model of mice tissues. The applied field induces temporary electric dipole; align permanent dipoles and causes drift of the charges in biological tissues. The friction associated with the movement of these dipoles and charges causes the rise in the absorption energy in the animal’s tissues. Due to the difficulty of the microscopic effect measurements, a useful model for both the EMF source and the affected biological system was used. The FDTD modelling method (WinFDTD simulation program) is used to predict the induced electric field strength and specific absorption rate (SAR) values in various biological tissues under wide range of exposure conditions in both phantoms and laboratory animals. The numerical results of the SAR showed that the SAR behaviour is function of input power and geometrics factor. In order to validate the obtained results, the computer models used phantom as a model of biological system. Although this model is relatively crude representation of the size and shape (weight and density) of the animal body. The experimental results depend on the phantom showed that the calculations of the average SAR, according to FDTD method agree reasonable with the empirical values and have been performed to investigate the energy dependence of specific absorption rate (SAR) in the visible light region.

Key words: Electromagnetic radiation, SAR, FDTD, Mouse