http://www.google.com/search?hl=en&q...=Google+Search

Bluetooth radios operate at much lower power levels than phones so, not surprisingly, the radiation added by a Bluetooth headset is insignificant by comparison.
http://www.businessweek.com/technolo...50427_5651.htm
http://www.google.com/search?hl=en&q...th&btnG=Search