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using wireless phones would provide some of the data that are needed. Lifetime
animal exposure studies could be completed in a few years. However, very large
numbers of animals would be needed to provide reliable proof of a cancer promot-
ing effect if one exists. Epidemiological studies can provide data that is directly
applicable to human populations, but 10 or more years’ follow-up may be needed to
provide answers about some health effects, such as cancer. This is because the inter-
val between the time of exposure to a cancer-causing agent and the time tumors
develop - if they do -may be many, many years. The interpretation of epidemiologi-
cal studies is hampered by difficulties in measuring actual RF exposure during
day-to-day use of wireless phones. Many factors affect this measurement, such as
the angle at which the phone is held, or which model of phone is used.
6. What is FDA doing to find out more about the possible health effects of
wireless phone RF?
FDA is working with the U.S. National Toxicology Program and with groups of inves-
tigators around the world to ensure that high priority animal studies are conducted
to address important questions about the effects of exposure to radiofrequency
energy (RF). FDA has been a leading participant in the World Health Organization
International Electromagnetic Fields (EMF) Project since its inception in 1996. An
influential result of this work has been the development of a detailed agenda
of research needs that has driven the establishment of new research programs
around the world. The Project has also helped develop a series of public information
documents on EMF issues. 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.
7. How can I find out how much radiofrequency energy exposure I can get
by using my wireless phone?
All phones sold in the United States must comply with Federal Communications
Commission (FCC) guidelines that limit radiofrequency energy (RF) 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 Specific Absorption Rate (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
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.
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Chapter 7 − Safety and Warranty
SafetySafety
8. What has FDA done to measure the radiofrequency energy coming from
wireless phones ?
The Institute of Electrical and Electronic Engineers (IEEE) is developing a technical
standard for measuring the radiofrequency energy (RF) 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 con-
sistency 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.
9. What steps can I take to reduce my exposure to radiofrequency energy
from my wireless phone?
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 radiofrequency
energy (RF). Since time is a key factor in how much exposure a person receives,
reducing the amount of time spent using a wireless phone will reduce RF exposure.
•
If you must conduct extended conversations by wireless phone every day, you
could place more distance between your body and the source of the RF, since the
exposure level drops off dramatically with distance.
For example, you could use a headset and carry the wireless phone away from your
body or use a wireless phone connected to a remote antenna. Again, the scientific
data do not demonstrate that wireless phones are harmful. But if you are concerned
about the RF exposure from these products, you can use measures like those
described above to reduce your RF exposure from wireless phone use.
10. What about children using wireless phones?
The scientific evidence does not show a danger to users of wireless phones,
including children and teenagers. If you want to take steps to lower exposure to
radiofrequency energy (RF), the measures described above would apply to children
and teenagers using wireless phones. Reducing the time of wireless phone use and
increasing the distance between the user and the RF source will reduce RF exposure.
Some groups sponsored by other national governments have advised that children
be discouraged from using wireless phones at all. For example, the government
in the United Kingdom distributed leaflets containing such a recommendation in
December 2000. They noted that no evidence exists that using a wireless phone
causes brain tumors or other ill effects. Their recommendation to limit wireless
phone use by children was strictly precautionary; it was not based on scientific
evidence that any health hazard exists.
Safety and Warranty − Chapter 7
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