A Report on Non-Ionizing Radiation

conductivity: Microwave News Article Archive (2004 - )

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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