Measurement of Output Radio Frequency Field Generated by Mobile Phones with Applied Sound in Different Strengths & Frequencies

Possible health risk associated with mobile telecommunication devices can be classified by dosimetry of the exposure. Dosimetry is an important but hard issue that is estimated by computational or experimental methods. Signal emitted from the mobile phones in different modulations such as talking or listening changes, so the level of exposure is different in different modulations. Talking and listening modulations of two different models of GSM 1800 MHz mobile phones were measured while modulated human speech, also pure tone with the intensity of 0-120 dB and frequency in between 125-8000 Hz applied through the phone. Our aim was to detect the minimum intensity of tone that changes the modulation of mobile phone from non-speaking mode to speaking mode, because it is known that there is parallel increase on the stress of the living things if the intensity of the sound is increasing. The data may be used for monitoring the daily exposure of the people using mobile phones, also defining the level of exposure at the laboratory experiments. It may be useful for the people for having individual precautions on using mobile phones in their daily lives.Key Words: Radio Frequency Radiation, mobile phone, sound, stress, GSM