How It's Tested?

The effects of the radiation depend on the rate at which energy is absorbed by a mass of tissue, like your head. It is called the specific absorption rate (SAR) and measured in watts per kilogram (W/kg). To test the (SAR) they use a mold in the shape of a human head that is filled with a fluid formulated to simulate the electrical properties of the human tissue. This fluid typically is made up of salt, sugar, water and a viscosity additive. Overall temperature and humidity was also controlled in this experiment. The first thing that is done is that they strap a phone to the head. The testing system consists of a computer-controlled probe, a robotic arm, amplifier output that connects to a PC and a cable that connects to a universal radio communication tester. The phone is placed on a simulated call with the radio communication tester. The probe scans the head, measures the frequency, and locates the spot of highest absorbtion. This process takes antwhere from 20 to 30 minutes to complete. http://www.wired.com/gadgetlab/2009/10/cellphone-radiation-testing/