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It is important to be able to quantify both the absorption of electromagnetic energy in the human body and the resulting thermal effect. In this study, the specific absorption rate (SAR) of electromagnetic radiation from mobile phones on the human head was investigated. As it is not possible to perform the experiments on human in vivo, the human head and the antenna radiated in 900 MHz were simulated. In this study, the spherical model as single layer and three layers was simulated by using Agilent High Frequency Structure Simulator, which employs the finite element method (FEM), and the EM power absorption rate of tissue was calculated by a C++ program. The results were compared with the results of the studies in the literature and a good agreement was obtained. To evaluate the efficiency of the method, a rat head was simulated and the results were compared with the experimental results obtained from the in vivo experiments conducted on the rats.