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

ABSTRACT 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

Keywords:

Radio Frequency Radiation, mobile phone, sound stress, GSM,

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Lin, J. C., “Hearing microwaves: the microwave auditory Propagation Magazine 43:166–168 (2001). Antennas and
Lopresto, V., Pinto, R., De Vita, A., Mancini, S., Galloni, P., C. Marino, C., Ravazzani, P., Lovisolo, G. A., “Exposure Setup to Study Potential Adverse Effects at GSM 1800 and UMTS Frequencies on the Auditory Systems of Rats” Radiation Protection Dosimetry, 123: 473–482 (2007).
Takebayashi, T., Varsier, N., Kikuchi, Y., Wake, K., Taki, M., Watanabe, S., Akiba, S., Yamaguchi, N., “Mobile phone use, exposure to radiofrequency electromagnetic field, and brain tumour: a case- control study” British Journal of Cancer, 98:652-9 (2008).
ICNIRP (International Commission on Non-Ionizing Radiation Protection). Guidelines for limiting exposure to timevarying electric, magnetic, and electromagnetic fields (up to 300 GHz). Health Physics 74(4):494–522 (1998).
Capri, M., Scarcella, E.,Bianchi, E., Fumelli, C., Mesirca, P., Agostini, C., Remondini, D, Schuderer, J, Kuster, N, Franceschi, C., Bersani, F., “1800 MHz radiofrequency (mobile phones, different Global System for Mobile communication modulations) does not affect apoptosis and heat shock protein 70 level in peripheral blood mononuclear cells from young and old donors” International Journal of Radiation Biology, 80: 389 – 397 (2004).
Wiart, J., Dale, C., Bosisio, A.V. and Le Cornec, A., “Analysis of the influence of the power control and discontinuous transmission on RF exposure with GSM Compatibility, IEEE Transactions 42: 376-385 (2000). Electromagnetic
Erdreich, L. S., Van Kerkhove, M. D., Scrafford, C.G., Barraj, L., McNeely, M., Shum, M., Sheppard, A. R., Kelsh, M., “Factors that Influence the Radiofrequency Power Output of GSM Mobile Phones”. Radiation Research, 168: 253–261 (2007).
REFLEX-Project, “Risk evaluation of potential environmental electromagnetic field exposure using sensitive in vitro methods” Report Final 274 (2004). from low energy
Keow, M.A., Radiman, S., “Assessment of radiofrequency/microwave radiation emitted by the antennas of rooftop-mounted mobile phone base stations” Radiation Protection Dosimetry, 121:122-7 (2006).
Henderson, S.I., Bangay, M.J., “Survey of RF exposure levels from mobile telephone base stations in Australia” Bioelectromagnetics 27(1):73-6 (2006).
Cooper, T.G., Mann, S.M., Khalid, M., Blackwell, R.P., “Public exposure to radio waves near GSM microcell and picocell base stations” Journal of Radiological Protection, 26 :199-211 (2006).
Kim, S.C., Nam, K.C., Kim, D.W., “Estimation of relative exposure levels for cellular phone users using a neural network”. Bioelectromagnetics, 27 : 440-4, (2006).
Ndoumbe' Mbonjo Mbonjo, H., Streckert, J., Bitz, A., Hansen, V., Glasmachers, A., Gencol, S., Rozic, D., “Generic UMTS Test Signal for RF Bioelectromagnetic Studies”, Bioelectromagnetics, 25:415-425, (2004).
Kramarenko, A.V., Tan, U., “Effects of high- frequency electromagnetic fields on human EEG: a brain mapping study”, International Journal of Neuroscience, 113:1007-1019, (2003).

Gazi University Journal of Science-Cover

Yayın Aralığı: Yılda 4 Sayı
Başlangıç: 1988
Yayıncı: Gazi Üniversitesi, Fen Bilimleri Enstitüsü

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