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Usage guidelines: All about performance and safety 149
tissue 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
website (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.
What has FDA done to measure the radio
frequency energy coming from wireless phones?
The Institute of Electrical and Electronic Engineers (IEEE) is
developing a technical standard for measuring the radio
frequency energy (RF) exposure from wireless phones and
other wireless hand sets 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.
MetroA610.book Page 149 Tuesday, July 6, 2004 3:12 PM