Biological Effects and Health Implications of Radiofrequency - download pdf or read online

By James C. Lin, Sol M. Michaelson

ISBN-10: 0306415801

ISBN-13: 9780306415807

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Tonic or clonic convulsions may also be provoked in rats by whole-body irradiation and in dogs by head irradiation [9, 10, 4851. This seems to depend on brain temperature, irrespective of rectal temperature. Local irradiation of the vertebral column at the IV-XIIth level causes death without prior convulsions. Death with convulsions may be obtained by head irradiation in monkeys [I21 and rabbits 14091. The importance of the relationship between the size of the irradiated object and the wavelength was demonstrated by investigations of the survival time of rats exposed to power densities of 100, 40, and 10 mW/cm2 at various microwave frequencies, millimeter, 3-cm, 10-cm, and decimeter waves [185, 3181.

Hifirst gives rise to conduction currents with associated energy loss due to electrical resistance of the medium, and the other affects the displacement current through the medium with an associated loss, due to viscosity. These effects control the behaviour of the complex relative dielectric constant : where: EO = permittivity of free space, e* = complex permittivity, E' = dielectric constant of the medium, real part, E" = loss factor of the medium or imaginary part. , 65 The effective conductivity (due to both conduction currents and dielectric losses) of the medium is related to E" by: and the loss tangent o is given by El' tano = --_ E' w = = o WE~E' the angular frequency.

These papers by Schwan 1474, 4751, Schwan and Piersol [483, 4841, and the monograph by Presman (438) should be consulted for further details, quantitative descriptions, and references. Useful data may be found also in the publication by Tell [546J, with the restriction that only planar layered models are considered by this author. In connection - -----with the-preceding remarks it should be added that Marha et al. [336] point out that, because-of the shortening of the wavelength in biological media, microwaves may have a wavelength g a r a b l e to the digensions-of macromole- - - ---_ cges, which may favor direct spatial resonance and result in deformation or damage.

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Biological Effects and Health Implications of Radiofrequency Radiation by James C. Lin, Sol M. Michaelson

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