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For Your Safety 173
7. How can I find out how much radiofrequency energy
exposure I can get by using my wireless device?
AlldevicessoldintheUnitedStatesmustcomplywithFederalCommunications
Commission(FCC)guidelinesthatlimitradiofrequencyenergy(RF)exposures.
TheFCC/ISEDCestablishedtheseguidelinesinconsultationwiththeFDAandthe
otherfederalhealthandsafetyagencies.TheFCC/ISEDClimitforRFexposure
fromwirelessdeviceissetataSpecificAbsorptionRate(SAR)of1.6watts
perkilogram(1.6W/kg).TheFCC/ISEDClimitisconsistentwiththesafety
standards developed by the Institute of Electrical and Electronic Engineering
(IEEE)andtheNationalCouncilonRadiationProtectionandMeasurement.The
exposure limit takes into consideration the body’s ability to remove heat from
the tissues that absorb energy from the wireless device and is set well below
levels known to have effects. Manufacturers of wireless devices must report
theRFexposurelevelforeachmodelofdevicetotheFCC/ISEDC.TheFCC
website (
http://www.fcc. gov/oet/rfsafety
)givesdirectionsforlocatingtheFCC
identification number on your device so you can find your device’s RF exposure level
in the online listing.
8. What has the FDA done to measure the radiofrequency
energy coming from wireless devices?
The Institute of Electrical and Electronic Engineers (IEEE) is developing a technical
standard for measuring the radiofrequency energy (RF) exposure from wireless
devices and other wireless handsets with the participation and leadership of FDA
scientists and engineers. The standard, ‘Recommended Practice for Determining
the Spatial- Peak Specific Absorption Rate (SAR) in the Human Body Due to
WirelessCommunicationsDevices:ExperimentalTechniques,’setsforththefirst
consistent test methodology for measuring the rate at which RF is deposited in
the heads of wireless device users. The test method uses a tissue simulating model
of the human head. Standardized SAR test methodology is expected to greatly
improve the consistency of measurements made at different laboratories on the
same device. SAR is the measurement of the amount of energy absorbed in tissue,
either by the whole body or a small part of the body. It is measured in watts/kg (or
milliwatts/g) of matter. This measurement is used to determine whether a wireless
device complies with safety guidelines.
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