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Table 1 Properties of the layers of the head at 1.8 GHz frequency

From: SAR reduction in the modelled human head for the mobile phone using different material shields

Head layers Conductivity (S/m) Relative permittivity Mass density (kg/m3)
Skin 1.1847 38.872 1010
Fat 0.078,388 5.3494 920
Skull 0.27,522 11.781 1810
Brain 0.91,494 37.011 1040