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By National Council on Radiation Protection and Measurements

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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)

Example text

3 Polarization The orientation of the incident electric and magnetic fields with respect to the irradiated object has a very strong effect on the strength of the fields inside the object. This orientation is defined in terms of the polarization of the incident fields. For objects of revolution (circular symmetry about the long axis), the polarization is defined in terms of which vector of the incident 54 / 2. BASIC CONCEPTS field, E, H or k, is parallel to the long axis of the body. The polarization is called E polarization, if E is parallel to the long axis, H if H is parallel to the long axis and K if k is parallel to the long axis of the body.

22 / 2. BASIC CONCEPTS from the right-hand rule: the thumb is pointed in the direction of the current (positive charge) and the fingers will circle in the direction of the magnetic field lines. 4 Quasi-Static Fields An important class of EM fields is quasi-static fields. These are fields that have the same spatial patterns as static fields, but vary with time. 7 were to vary slowly with time, the field patterns would vary correspondingly with time, but a t any one instant would be similar to the static field patterns shown in the figures.

8. The magnetic field produced by an infinitely long straight direct current element. The direction of the current is upward from the page toward the reader. Current Loop I Fig. 9. The magnetic field produced by a circular current loop. 22 / 2. BASIC CONCEPTS from the right-hand rule: the thumb is pointed in the direction of the current (positive charge) and the fingers will circle in the direction of the magnetic field lines. 4 Quasi-Static Fields An important class of EM fields is quasi-static fields.

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