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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.
Performance and Safety Guidelines
171
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