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 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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18,the meter would read zero because H would be zero at that point. One might erroneously concIude that since the meter indicates zero S, a person located at that point would be safe in the sense that the person would absorb no energy. Furthermore, one meter measuring E2 and another measuring H2 would indicate different values of equivalent plane-wave power density, perhaps causing one to conclude erroneously that one meter or the other were faulty. The best procedure is to measure both,!? and@ separately.

In AM fields, the detected average field strength may be substantially less than the instantaneous peak value. The exact value of the average field strength of an AM RF field will be dependent on the nature of the modulating signal. For example, voice modulation, telegraphy and pulse modulation (such as used by radars) will all result in characteristic ratios of average to peak field strengths. 3 Frequency Modulation. Frequency modulation (FM) occurs when the instantaneous frequency deviation of the modulated carrier wave with respect t o the frequency of the unmodulatedcarrier wave is proportional to the amplitude of the modulating signal.

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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