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Table 1 Properties of tissues in human head

From: SAR assessment on three layered spherical human head model irradiated by mobile phone antenna

Tissue Brain diameter (mm) Skull thickness (mm) Skin thickness (mm)
4 year child 136.1 3.1 3.6
8 year child 140.6 3.5 4
Adult 160.1 8.9 7.2
Permittivity 52.7 12.5 35.2
Conductivity (S/m) 0.94 0.14 0.60