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Effects of Mobile Telephone
Radiation
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So far, the only known mechanism that mobile telephone
radiation has had an effect on living tissue is heating. The
rise in temperature on the surface of the brain caused by
radio waves is 0.3 degrees at the most. This kind of
temperature rise is not known to have biological
significance. The temperature of the brain normally
fluctuates by about one degree, and only after a five degree
increase in temperature do cells become damaged.
Several studies, in several countries, have tried to find
out any other effects apart from heating. On the basis of
the results obtained from the studies, it has not been
possible to conclude that radiation from mobile phones would
be detrimental to health.
Experiments performed on cell cultures, also performed at
STUK, have produced indicators that mobile telephone
radiation could cause temporary changes in the functions of
cells. These functions include the functions of genes,
activation of proteins, and the internal chemical
communication within cells. The trigger for these changes is
unknown. It is only known that this phenomenon is not the
result of excessive heating of tissue.
Radio waves at the
radiation level of mobile phones may increase the
permeability of the so-called blood-brain barrier. The
blood-brain barrier regulates the passing of material
between the bloodstream and brain cells. Possible changes
are, however, minimal and disappear quickly when the
radiation stops. This could possibly be a case of a change
caused by microscopic heating. The occurrence falls within
the realm of physiological fluctuation and is not known to
be harmful.
Approximately 20 general population studies concerning the
causal relation of possible tumour risk and mobile phone use
have been carried out. On the grounds of the studies to
date, it is not possible to make such a conclusion that
mobile phones would cause a health risk. Nevertheless,
certain analyses that combine several earlier studies have
reported an increased risk of brain tumour in people who
have used a mobile phone for a long time (more than ten
years). These studies however involve uncertainties. One
source of error is a memory illusion related to the fact
that mobile phone use and call durations that took place
many years are ago are difficult to recall exactly.
Since it takes years to develop a cancer and mobile phones
have been in common use only for about ten years, the
possibility, that a link between mobile phone use and cancer
might be found in later population studies, cannot be ruled
out.
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