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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    What is radiofrequency energy (RF)?

    Radiofrequency (RF) energy is another name for radio waves. It is one form of electromagnetic energy that makes up the electromagnetic spectrum. Some of the other forms of energy in the electromagnetic spectrum are gamma rays, x-rays and light. Electromagnetic energy (or electromagnetic radiation) consists of waves of electric and magnetic energy moving together (radiating) through space. The area where these waves are found is called an electromagnetic field.

    Radio waves are created due to the movement of electrical charges in antennas. As they are created, these waves radiate away from the antenna. All electromagnetic waves travel at the speed of light. The major differences between the different types of waves are the distances covered by one cycle of the wave and the number of waves that pass a certain point during a set time period. The wavelength is the distance covered by one cycle of a wave. The frequency is the number of waves passing a given point in one second. For any electromagnetic wave, the wavelength multiplied by the frequency equals the speed of light. The frequency of an RF signal is usually expressed in units called hertz (Hz). One Hz equals one wave per second. One kilohertz (kHz) equals one thousand waves per second, one megahertz (MHz) equals one million waves per second, and one gigahertz (GHz) equals one billion waves per second.

    RF energy includes waves with frequencies ranging from about 3000 waves per second (3 kHz) to 300 billion waves per second (300 GHz). Microwaves are a subset of radio waves that have frequencies ranging from around 300 million waves per second (300 MHz) to three billion waves per second (3 GHz).

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