Epidemiological principles for EMF and EMR studies - Lincoln ...

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PROPERTIES OF ELECTROMAGNETIC WAVES IN BIOLOGICAL MEDIA,
(Johnson and Guy (1972))
TABLE 6: Muscle, Skin, and Tissues with High Water Content
Wavelength Dielectric Conductivity Wavelength Depth of
Frequency in Air Constant σH λH Penetration*
(MHz) (cm) ε H (mho/m) (cm) (cm)
1 30000 2000 0.40 436 91.3
10 3000 160 0.63 118 21.6
27.12 1106 113 0.61 68.1 14.3
40.68 738 97.3 0.69 51.3 11.2
100 300 71.7 0.89 27.0 6.66
200 150 56.5 1.28 16.6 4.79
300 100 54 1.37 11.9 3.89
433 69.3 53 1.43 8.76 3.57
750 40 52 1.54 5.34 3.18
915 32.8 51 1.60 4.46 3.04
1500 20 49 1.77 2.81 2.42
2450 12.2 47 2.21 1.76 1.70
3000 10 46 2.26 1.45 1.61
5000 6 44 3.92 0.89 0.79
5800 5.17 43.3 4.73 0.78 0.72
8000 3.75 40 7.65 0.58 0.41
10000 3 39.9 10.30 0.46 0.34
λH : The wavelength inside the high water content tissue; * Depth of
penetration is based on the depth at which the intensity drops to the level of
1/e, i.e. about 36.8%.
TABLE 7: Fat, Bone, and Tissues with Low Water Content
Frequency Wavelength Dielectric Conductivity Wavelength Depth of
in Air Constant σL λL Penetration
(MHz) (cm) εL (mmho/m) (cm) (cm)
1 30000
10 3000
27.12 1106 20 10.9-43.2 241 159
40.68 738 14.6 12.6-52.8 187 118
100 300 7.45 19.1-75.9 106 60.4
200 150 5.95 25.8-94.2 59.7 39.2
300 100 5.7 31.6-107 41.0 32.1
433 69.3 5.6 37.9-118 29.8 26.2
750 40 5.6 49.8-138 16.8 23.0
915 32.8 5.6 55.6-147 13.7 17.7
1500 20 5.6 70.8-171 8.41 13.9
2450 12.2 5.5 96.4-213 5.21 11.2
3000 10 5.5 110-234 4.25 9.7
5000 6 5.5 162-309 2.63 6.7
5900 5.17 5.05 186-338 2.29 5.2
8000 3.75 4.7 255-431 1.73 4.6
10000 3 4.5 324-549 1.41 3.4
λL : The wavelength inside the low water content tissue;