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The IEEE is developing a technical standard for
measuring the RF energy exposure from wireless
phones 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 Wireless
Communications devices: Experimental Techniques”,
sets forth the first consistent test methodology for
measuring the rate at which RF is deposited in the
heads of wireless phone 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 phone. 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 phone complies with safety guidelines.
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If there is a risk from these products—and at this point
we do not know that there is—it is probably very small.
But if you are concerned about avoiding even potential
risks, you can take a few simple steps to minimize your
exposure to RF energy. Since time is a key factor in how
much exposure a person receives, reducing the amount
of time spent using your device’s phone function will
reduce RF exposure.
FDA and the Cellular Telecommunications & Internet
Association (CTIA) have a formal Cooperative Research
and Development Agreement (CRADA) to do research
on wireless phone safety. FDA provides the scientific
oversight, obtaining input from experts in government,
industry, and academic organizations. CTIA-funded
research is conducted through contracts to independent
investigators. The initial research will include both
laboratory studies and studies of wireless phone users.
The CRADA will also include a broad assessment of
additional research needs in the context of the latest
research developments around the world.
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All phones sold in the United States must comply with
FCC guidelines that limit RF energy exposures. FCC
established these guidelines in consultation with FDA
and the other federal health and safety agencies. The
FCC limit for RF exposure from wireless telephones is
set at a SAR of 1.6 watts per kilogram (1.6 W/kg). The
FCC limit is consistent with the safety standards
developed by the Institute of Electrical and Electronic
Engineering (IEEE) and the National Council on
Radiation Protection and Measurement. The exposure
limit takes into consideration the body's ability to remove
heat from the tissues that absorb energy from the
wireless phone and is set well below levels known to
have effects.
Manufacturers of wireless phones must report the RF
exposure level for each model of phone to the FCC. The
FCC web site (http://www
.fcc.gov/oet/rfsafety) gives
directions for locating the FCC identification number on
your phone so you can find your phone's RF exposure
level in the online listing.