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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 Online 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 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)

Sample text

The time variation of an electric field at a point in space. A detector fixed a t one point in space would be subject to a function that oscillated with time as the wave passed by. This is similar to an individual standing on the beach and watching a wave go by. The value of the crest of the wave is called the peak value or amplitude of the wave. 13 is 10 V m-'. 13). : The unit of T is second; that o f f is Hz, which is equivalent to cycles per second. 2 ELECTROMAGNETIC FIELDS / 29 by counting the number of crests (or troughs) that passed by a fixed point in 1s.

A dipole consists of a combination of a positive and a negative charge separated by a small distance. In this case, the dipole is said to be induced, because it is caused by the applied electric field. When the applied electric field is removed, the dipole disappears. When the charges are separated by the applied electric field, the charges no longer cancel, and in effect, new charge is created. This new charge is called polarization charge. Polarization charge creates new fields that did not exist previously.

29. Penetration depth versus frequency for a dielectric half-space with permittivity equal to two-thirds that of muscle. models show a characteristic that turns out to be generally true for other objects as well. At lower frequencies the fields penetrate much deeper than at the higher frequencies. At higher microwave frequencies, any heating that occurs in a lossy material as the result of plane-wave irradiation will be primarily surface heating. 2 Other Models. Other models, including spheres, cylinders, prolate spheroids (shaped like an egg) and block models (cubical mathematical cells arranged in a shape like a human body) have been used to represent the human body in making calculations and measurements of the energy absorbed during plane-wave irradiation.

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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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