"There were very few cell phones in service back in 1996, and now, by some estimates, there are 5 billion globally," Crofton said. "The other concern is that the standards were based only on testing a 200-pound male mannequin, but the standards do not apply to more sensitive groups, such as children, pregnant women and teens."
Current research has delved far more deeply into the potential risks. David Gultekin, a researcher at the Memorial Sloan-Kettering Cancer Center in New York, is conducting research into Specific Absorption Rates (SAR) of radiation into brain tissue via cell phone radiation.
"This needs further study, but what we know right now is that it is heavily absorbed by brain tissue," said Gultekin. "Radiation penetrates the brain and gets absorbed. It also causes the temperature of the tissue to rise. We also know that absorption is not uniform throughout the brain, that there are hot spots that cause variations in energy inside the tissue."
Gultekin says his research represents the first time absorption is measured in real brain tissue. The methods FCC approved in 1996 for wide certification of cell phones was not derived from research that penetrated the tissue to measure absorption.