A Practical Guide to the Determination of Human Exposure to by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

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Additional info for A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119)

Example text

1978; 1986). Also see the following special issues devoted to these subjects; Radio Science (1977; 1979), Proceedings of the IEEE (1980). , 1978). For the models of an adult human, a resonance occurs a t about 70 MHz for E polarization. For the rat the resonance occurs a t a frequency of about 600 MHz. As shown in the figures, the resonance frequency is related to the length of the body. In general, resonance occurs a t a frequency for which the length of the body is approximately onehalf of a free-space wavelength.

The orientation of each dipole is slight, because the thermal excitation is relatively strong, but on the average, there is a net alignment of dipoles over the randomness that existed without the applied field. Like induced dipoles, this net alignment of permanent dipoles also produces new fields. The drift of conduction charges in a n applied electric field occurs because conduction charges are free enough that they can move significant distances in response to the forces of the applied fields.

For free space, EH-I = 377 ohms. 4. E and H are constant in any plane perpendicular to the direction of propagation. 5. The magnitude of the velocity of propagation is given by v = ( p ~ ) - %The . velocity is less and the wavelength is shorter for a wave propagating in matter than for a wave propagating in free space. 16 shows a plane wave. E and H could have any direction in the plane, so long as they are perpendicular to each other. Far away from its source, a spherical wave can be considered to be approximately a plane wave in a limited region of space because the curvature of the wavefronts is so small that they appear to be almost planar.

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