A Report on Non-Ionizing Radiation

Camelia Gabriel: Microwave News Article Archive (2004 - )

May 3, 2010

Fifteen years ago Om Gandhi pointed out that children are exposed to higher levels of radiation from cell phones than adults. He was right then and he is right today. Yet, no one could blame you for thinking otherwise.

In an article published in the May issue of Harper's, Nathaniel Rich uses this putative controversy, among a number of other examples, to make the case that confusion reigns in all aspects of cell-phone research. "The brain of a child absorbs a much greater amount of radiation from a cell phone than does the brain of an adult," he writes, adding immediately after, "No, it does not."

April 4, 2010

The bone marrow of young pigs has a higher water content than adult bone marrow and, as expected, Peyman and Gabriel found that it has a higher conductivity. A little math might help understand why a higher water content in tissues this leads to higher SARs. Start with the basic equation for calculating the SAR:

SAR = σ E2 / ρ

where σ = conductivity of the tissue; E = electric field, ρ = density of the tissue

More simply, this means that the SAR is proportional to the conductivity:

SAR σ

and therefore as the conductivity increases, so does the SAR.

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