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absorption of RF energy in the head because the phone, which
is the source of the RF emissions, will not be placed against the
head.
On the other hand, if the phone is mounted against the waist or
other part of the body during use, then that part of the body will
absorb more RF energy. Wireless phones marketed in the U.S.
are required to meet safety requirements regardless of whether
they are used against the head or against the body. Either
configuration should result in compliance with the safety limit.
k Do wireless phone accessories that claim to shield
the head from RF radiation work?
Since there are no known risks from exposure to RF emissions
from wireless phones, there is no reason to believe that
accessories that claim to shield the head from those emissions
reduce risks. Some products that claim to shield the user from
RF absorption use special phone cases, while others involve
nothing more than a metallic accessory attached to the phone.
Studies have shown that these products generally do not work as
advertised. Unlike “hands-free” kits, these so-called “shields” may
interfere with proper operation of the phone. The phone may be
forced to boost its power to compensate, leading to an increase in
RF absorption. In February 2002, the Federal Trade Commission
(FTC) charged two companies that sold devices that claimed to
protect wireless phone users from radiation with making false
and unsubstantiated claims. According to FTC, these defendants
lacked a reasonable basis to substantiate their claim.