User's Manual

Table Of Contents

U.S. FDA 51

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these questions, no clear picture of the biological ef-

fects of this type of radiation has emerged to date.

Thus, the available science does not allow us to con-

clude that mobile phones are absolutely safe, or that

they are unsafe. However, the available scientific evi-

dence does not demonstrate adverse health effects as-

sociated 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 po-

sitioned close to the user's head during normal tele-

phone conversation. These types of mobile phones are

of concern because of the short distance between the

phone's antenna – the primary source of the RF – and

the person's head. The exposure to RF from mobile

phones in which the antenna is located at greater dis-

tances from the user (on the outside of a car, for exam-

ple) is drastically lower than that from hand-held

phones, because a person's RF exposure decreases rap-

idly with distance from the source. The safety of so-

called “cordless phones,” which have a base unit con-

nected to the telephone wiring in a house and which

operate at far lower power levels and frequencies, has

not been questioned.