What is S.A.R.? Answer: S.A.R. or Specific Absorption Rate of Radiation is used to measure the amount of radiation that the human body absorbs from any source, including cellular phones. The F.C.C. (Federal Communications Commission) sets limits as to what they deemed were safe levels of radiation from cell phones. In the beginning when analog phones were 800-900 MHZ of power, most of the cell phones manufactured met these safe guidelines. However as manufacturers raised the power of their phones up to 1800-2000MHZ and analog was replaced by digital, the majority of the cell phones now exceed the safe levels set by the F.C.C. In fact the manufacturers continue to lobby to have the levels raised, so they may keep increasing the power of the phones. The highest S. A. R. in the body is in the ear, thus the concern about excessive cell phone use and the strength of the signal.
How is S.A.R. measured on a cell phone? Answer: When a call is made or received there is a band of radiation from the antenna, half of which disappears into space. The remaining radiation is around the skull, face and ear area of the user and runs through the circuitry of the phone when transmitting the call. A dummy head is immersed in a gel-like solution similar to body fluid and a cell phone is attached to the ear. Readings are taken from the antenna to determine the S.A.R. strength which will vary from phone to phone and proximity to the closest signal tower.