What level of radio frequency exposure is associated with the different types of wireless phones (hand-held cellular phones, car cellular phones, transportable cellular phones, and cordless phones)?
The closer the transmitter of the wireless telephone is to the body, the greater the exposure. With hand-held cellular phones, the radio transmitter is in the handset which is typically held against the sideof the head while the phone is in use. With car cellular phones the antenna is mounted on the outside of the car some distance from the user. With transportable cellular phones or bag phones the transmitter is with the battery pack in a portable unit separate from the handset. Cordless phones are not cellular phones. They have a base unit wired to the land-line telephone service and typically operate at a lower frequency and much lower power than other wireless phones. Lower power is typical of cordless phones because the radio signal from the handset only needs to reach the base unit in the home or office versus a distant base station. If hand-held cellular phones do not cause brain tumors, it would be surprising if the other types of phones do. They involve much lower radiation ex
