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5. What research is
needed to decide
whether RF exposure
from wireless phones
poses a health risk?
A combination of laboratory
studies and epidemiological
studies of people actually
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 promoting 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
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 diffi culties
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 the FDA doing
to fi nd out more about
the possible health
effects of wireless
phone RF?
The FDA is working with
the U.S. National Toxicology