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.
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 investigators 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
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