Read e-book online A Practical Guide to the Determination of Human Exposure to PDF

By National Council on Radiation Protection and Measurements

ISBN-10: 0929600355

ISBN-13: 9780929600352

ISBN-10: 1435629922

ISBN-13: 9781435629929

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Read or Download 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) PDF

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Additional resources 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)

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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.

In terms of average power, Poynting's theorem is: where the brackets designate the time average of the quantity. 30 states that the sum of the average power possessed by charged particles in the volume and the total average power passing out through A is always equal to zero. 31: - ]-da = f dV. 31) V A The term on the left is the total average power passing in through A, which is equal to the total average power transferred to the charged particles in the volume. Thus, if interpreted properly with respect to a closed surface, the Poynting vector E x H can be a useful parameter in describing nonionizing radiation fields, but it must be used with considerable caution.

By employing such data, accurate computations of the expected field strength may be made at any given spatial point in the vicinity of the antenna. 26 illustrates the radiation pattern of a dipole antenna. Note the broad beamwidth of the bidirectional pattern. ' A half-wave dipole's 'Decibel, (dB), is a dimensionless quantity that is proportional to the logarithm of the ratio of two values of the same physical quantity. END VIEW OF DIPOLE $=0° Fig. 26. Radiation patterns of the half-wave dipole.

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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) by National Council on Radiation Protection and Measurements


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