Cell Phone Safety
 Is My Cell Phone Safe? 
  • Are cell phones dangerous?
  • Which phones are subject?
  • What's the research say?
  • What's the FDA's role in this?

    •  Radiofrequency Energy 
  • What's radiofrequency energy?
  • How is RF energy used?
  • How is RF radiation measured?
  • What level of RF is safe?

    •  Cell Phone Accessories 
  • Do hands-free kits reduce risk?
  • Do cell phone shields work?
  • What are base stations?
  • Are base stations safe?

    •  Other Safety Issues 
  • What about use on aircrafts?
  • Are cell towers/antennas safe?
  • What about towers near schools?
  • What about cell phone fraud?
    • Cell Phone Accessories

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    How is radiofrequency radiation measured?

    RF waves and RF fields have both electrical and magnetic components. It is often convenient to express the strength of the RF field in terms of each component. For example, the unit "volts per meter" (V/m) is used to measure the electric field strength, and the unit "amperes per meter" (A/m) is used to express the magnetic field strength. Another common way to characterize an RF field is by means of the power density. Power density is defined as power per unit area. For example, power density can be expressed in terms of milliwatts (one thousandth of a watt) per square centimeter (mW/cm2 or microwatts (one millionth of a watt) per square centimeter (µW/cm2).

    The quantity used to measure how much RF energy is actually absorbed by the body is called the Specific Absorption Rate or SAR. The SAR is a measure of the rate of absorption of RF energy. It is usually expressed in units of watts per kilogram (W/kg) or milliwatts per gram (mW/g).

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