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Many public agencies along with the general population have heard numerous reports about how mobile phone devices emit radiation that is absorbed by the users body These startling accounts have begun to worry many safety organizations and many are disappointed to announce the inconclusive research behind cell phone risk Numerous companies including the United States Government have conducted experiments dealing with the dangers of this type of radiation and the results of these tests usually come back with contradictory answers Before we begin to analyze how the radiation levels affect the health of human begins it is important we first discuss the definition and type of radiation associated with telecommunication devices The radiation emitted by cellular phones is classified as radio frequency or RF US FDA 1 and is expressed in a unit called a hertz HZ which is equal to one wave per second More commonly RF is measured by means of its power density or the power per unit area expressed in milliwatts per square centimeter mWcm2 The quality used to measure how much RF energy is actually absorbed by the body is called the Specific Absorption Rate or SAR It is usually expressed in units of Watts per kilogram Wkg or milliwatts per gram mWg Many organizations have run test to determine a safe level for SAR absorption in the human body The Federal Communications Commission or FCC guidelines are derived from two expert organizations called the National Council on Radiation Protection and Measurements NCRP and the Institute of Electrical and Electronics Engineers IEEE These organizations have labeled the SAR value of four watts per kilogram 4Wkg as a threshold level of exposure at which radiation can harm body tissues US FDA 3 The SAR level of 4Wkg was adopted as the US legal limit in 1996 after US guidelines were updated through the telecommunication act of 1996 The US guideline was enacted because it is believed that large
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