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. 2016 Feb 26;16(3):298. doi: 10.3390/s16030298

Table 2.

Typical Depths of penetration [64].

Metal %IACS Resistivity Ω·m Permeability 36.8% Depth of Penetration
1 kHz 4 kHz 16 kHz 64 kHz 256 kHz 1 MHz
copper 100 1.7 1 0.082 0.041 0.021 0.010 0.005 0.0026
6061 T-6 42 4.1 1 0.126 0.063 0.032 0.016 0.008 0.004
7075 T-6 32 5.3 1 0.144 0.072 0.036 0.018 0.009 0.0046
Magnesium 37 4.6 1 0.134 0.067 0.034 0.017 0.008 0.0042
Lead 7.8 22 1 0.292 0.146 0.073 0.37 0.018 0.0092
Uranium 6.0 29 1 0.334 0.167 0.084 0.042 0.021 0.0106
Zirconium 3.4 70 1.02 0.516 0.258 0.129 0.065 0.032 0.0164
Steel 2.9 60 750 0.019 0.0095 0.0048 0.0024 0.0012 0.0006
Cast steel 10.7 16 175 0.018 0.0089 0.0044 0.0022 0.0011 0.0006