any adverse health effects associated with the use of mobile 
phones. 
What kinds of phones are in question?
Questions have been raised about hand held mobile phones, the 
kind that have a built in antenna that is positioned close to the 
user s head during normal telephone conversation. These types 
of mobile phones are of concern because of the short distance 
A
between the phone s antenna  the primary source of the RF  and 
dd
the person s head. The exposure to RF from mobile phones in 
ition
which the antenna is located at greater distances from the user 
al
(on the outside of a car, for example) is drastically lower than that 
 H
from hand held phones, because a person s RF exposure 
eal
decreases rapidly with distance from the source. The safety of 
th an
so called "cordless phones," which have a base unit connected 
to the telephone wiring in a house and which operate at far lower 
d Sa
power levels and frequencies, has not been questioned. 
fety I
How much evidence is there that hand held 
n
mobile phones might be harmful?
form
Briefly, there is not enough evidence to know for sure, either way; 
ati
however, research efforts are on going. The existing scientific 
o
evidence is conflicting and many of the studies that have been 
n (FD
done to date have suffered from flaws in their research methods. 
Animal experiments investigating the effects of RF exposures 
A)
characteristic of mobile phones have yielded conflicting results. A 
few animal studies, however, have suggested that low levels of 
RF could accelerate the development of cancer in laboratory 
animals. In one study, mice genetically altered to be predisposed 
to developing one type of cancer developed more than twice as 
many such cancers when they were exposed to RF energy 
compared to controls. There is much uncertainty among 
scientists about whether results obtained from animal studies 
125






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