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Power density, field intensity, and carrier frequency determinants of RF-energy-lnduced calcium-ion efflux from brain tissue

✍ Scribed by Dr. William T. Joines; Carl F. Blackman

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
293 KB
Volume
1
Category
Article
ISSN
0197-8462

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✦ Synopsis

Abstract

To explain a carrier frequency dependence reported for radiofrequency (RF)‐induced calcium‐ion efflux from brain tissue, a chick‐brain hemisphere bathed in buffer solution is modeled as a sphere within the uniform field of the incident electromagnetic wave. Calculations on a spherical model show that the average electric‐field intensity within the sample remains the same at different carrier frequencies if the incident power density (P~i~) is adjusted by an amount that compensates for the change in complex permittivity (ϵ) and the change of wavelength, as a function of carrier frequency. The resulting formula for transforming P~i~ is seen to follow the pattern of both positive and negative demonstrations of calcium‐ion efflux that have been observed at carrier frequencies of 50, 147, and 450 MHz. Indeed, all results obtained at these three frequencies, when related by P~i~'s that produce the same average electric‐field intensity within the sample, are seen to be in agreement; no prediction is contradicted by an experiment.

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Calcium-ion efflux from brain tissue: Po
Calcium-ion efflux from brain tissue: Power-density versus internal field-intensity dependencies at 50-MHz RF radiation
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