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more years' follow-up may be needed to provide answers about some health effects, such as cancer. This is
because the interval 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 epidemiological 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.
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 investigators around the world to
ensure that high priority animal studies are conducted to address important questions about the effects of exposure
to radio frequency 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 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.
What steps can I take to reduce my exposure to radio frequency 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 radio frequency 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.
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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.