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Do wireless device accessories that claim to shield the head from RF radiation work?
Since there are no known risks from exposure to RF emissions from wireless devices,
there is no reason to believe that accessories that claim to shield the head from those
emissions reduce risks. Some products that claim to shield the user from RF absorption
use special device cases, while others involve nothing more than a metallic accessory
attached to the device. Studies have shown that these products generally do not work as
advertised. Unlike ¡°hand-free¡± kits, these so-called ¡°shields¡± may interfere with proper
operation of the device. The device may be forced to boost its power to compensate,
leading to an increase in RF absorption. In February 2002, the Federal trade Commission
(FTC) charged two companies that sold devices that claimed to protect wireless device
users from radiation with making false and unsubstantiated claims. According to FTC,
these defendants lacked a reasonable basis to substantiate their claim.
What about wireless device interference with medical equipment?
Radio frequency energy (RF) from wireless devices can interact with some electronic
devices. For this reason, FDA helped develop a detailed test method to measure
electromagnetic interference (EMI) of implanted cardiac pacemakers and defibrillators from
wireless telephones. This test method is now part of a standard sponsored by the
Association for the Advancement of Medical instrumentation (AAMI). The final draft, a joint
effort by FDA, medical device manufacturers, and many other groups, was completed in
late 2000. This standard will allow manufacturers to ensure that cardiac pacemakers and
defibrillators are safe from wireless device EMI. FDA has tested wireless devices and
helped develop a voluntary standard sponsored by the Institute of Electrical and Electronic
Engineers (IEEE). This standard specifies test methods and performance requirements for
hearing aids and wireless devices so that no interference occurs when a person uses a
compatible device and a compatible hearing aid at the same time. This standard was
approved by the IEEE in 2000.
FDA continues to monitor the use of wireless devices for possible interactions with other
medical devices. Should harmful interference be found to occur, FDA will conduct testing
to assess the interference and work to resolve the problem.
Additional information on the safety of RF exposures from various sources can be
obtained from the following organizations:
• FCC RF Safety Program : ttp://www.fcc.gov/oet/rfsafety/
• Environmental Protection Agency (EPA) : http://www.epa.gov/radiation/
• Occupational Safety and Health Administration's (OSHA) :
ttp://www.osha.gov/SLTC/radiofrequencyradiation/index.html
• National institute for Occupational Safety and Health (NIOSH) :
http://www.cdc.gov/niosh/emfpg.html
• World health Organization (WHO): http://www.who.int/peh-emf/
• International Commission on Non-Ionizing Radiation Protection: http://www.icnirp.de
• National Radiation Protection Board (UK): http://www.nrpb.org.uk
• Updated 4/3/2002: US food and Drug Administration http://www.fda.gov/cellphones
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