5 Th International Conference on Automation Control Engineering & Computer Science (ACECS’18),19-22 Dec 2018, Hammamet-Tunisia Investigation of EMF Radiation From GSM Base Stations and Mobile Antenna Towers in Different Locations–Libya Amer R. Zerek 1 , Saleh Alahimer 2 and Mohamed M. M. Elfituri 3 1 Zawia University, Faculty of Engineering/ EE Department,, Zawia, – Libya, E-mail anas_94az@yahoo.co.uk 2 College of Electronic Technology, Communication Engineering Department, Tripoli, Libya E-mail salahahimer@yahoo.com 3 Authority of Natural Science Research and Technology. Tripoli, Libya E mail melfituri@yahoo.com Abstract— Cellular and wireless technology have high growing and demand worldwide. Some countries regulate the exposure and installation of radio frequency RF transmission stations. The purpose of this paper to assess the exposure of RF radiation from a selected cellular tower and mobile base stations antennas. Technology develops continuously, so the characteristics of radiation from electromagnetic field EMF sources expect to change in the power level and frequency of operation, which indicate of change of Human exposed level. This undertakes EMF surveys to investigate the levels of the power density of the global system for mobile communication GSM within some school buildings and compare the results with international standards for human exposure compliance. Keywords- BTS, EMF Waves, GSM, Mobile Phones, Radiation. I. INTRODUCTION Biological effect of EMF radiation depends on both the power level and frequency [1]. As the RF energy is directly proportional to the frequency, the shorter wavelengths of waves the more energy produces, that why level exposure varies depending frequency. People are exposed every day to RF Radiation from both natural and man-made EMF sources. Exposure to RF radiation and its potential biological effects is becoming the subject of concern. The EMF levels continue to increase as technology growth. Libya has now fast growth in the telecommunication industry with no clear guidelines. Most of the providers are more concern about profits and deliver their service by increasing the coverage areas regardless of RF radiation concern. Accordingly, it becomes necessary to manage and monitor the levels of transmitted energy by such sources. This study discusses measurements and survey of RF radiation that produced by GSM system in some locations in the city of Tripoli. II. BIOLOGICAL EFFECTS The biological effects of RF radiation can be classified as thermal and non-thermal Effects. Thermal impact are generally associated with the heat produced by EMF sources in a specific area. The thermal effect has sufficient energy to make an increase in the temperature of the human body (e.g. exceeding 1 °C ) in a level above 4w/kg “watts per kilogram”. Non-thermal effects are associated with the amount of energy absorbed by a biological system that may cause changes in the system properties. Many studies and researches show that the maximum increase in temperature of the body exposed to GSM with 0.25 Watt power level antenna at 900 MHz and 1800 MHz were less than 0.1°. III. INTERNATIONAL STANDARDS Various international guidelines and recommendations are implemented for protecting people from RF exposure. The safety limit is not an exact line between safe and risk; it provides a means of protection. The expected effect occur at levels of exposure results in significant heating of part or whole body. The International Commission on Non-Ionizing Radiation Protection ICNIRP develops international guidelines and scientific advice on limiting exposure to non- ionizing radiation. ICNIRP limits are used in this study as a reference for comparison of the power measurements. Table I shows ICNIRP limits for potential exposure to EMF from high- frequency sources such as mobile phone System.