Samsung SCH-a650 Series User Manual page 123

primary brain cancer, glaucoma, meningioma, or acoustic
neuroma, tumors of the brain or salivary gland, leukemia, or
other cancers. None of the studies demonstrated the
existence of any harmful health effects from wireless phones
RF exposures. However, none of the studies can answer
questions about long-term exposures, since average period
of phone use in these studies was around three years.
What research is needed to decide whether RF
exposure from wireless phones poses a health
threat?
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 ten 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 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. Toxicology Program and with
groups of investigators around the world to ensure that high
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Usage guidelines: All about performance and safety