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    Question ID:   16617         Current Version: 1
Question: How is a cell phone user exposed to radio frequency energy?
Category: Consumer Electronics > Phones
Keywords: cell phone, user, expose, radio frequency energy, RF
Type: how
Rating:(0 ratings)    Views: 291    Discussions: 0   In Watch Lists: 1  

 
    Answer:
A cell phone's main source of radio frequency (RF) energy is produced through its antenna. The antenna of newer hand-held cell phones is in the handset, which is typically held against the side of the head when the telephone is in use. The closer the antenna is to the head, the greater a person's expected exposure to RF energy. The amount of RF energy absorbed by a person decreases significantly with increasing distance between the antenna and the user. The intensity of RF energy emitted by a cell phone depends on the level of the signal.

When a call is placed from a cell phone, a signal is sent from the antenna of the phone to the nearest base station antenna. The base station routes the call through a switching center, where the call can be transferred to another cell phone, another base station, or the local land-line telephone system. The farther a cell phone is from the base station antenna, the higher the power level needed to maintain the connection. This distance determines, in part, the amount of RF energy exposure to the user.

Source: National Cancer Institute
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