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

Publication ,  Journal Article
Joines, WT; Blackman, CF
Published in: Bioelectromagnetics
1980

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 (Pi) is adjusted by an amount that compensates for the change in complex permittivity (epsilon *r) and the change of wavelength, as a function of carrier frequency. The resulting formula for transforming Pi 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 Pi'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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Published In

Bioelectromagnetics

DOI

ISSN

0197-8462

Publication Date

1980

Volume

1

Issue

3

Start / End Page

271 / 275

Location

United States

Related Subject Headings

  • Radio Waves
  • Electromagnetic Fields
  • Chickens
  • Calcium
  • Brain
  • Biophysics
  • Animals
  • 17 Psychology and Cognitive Sciences
  • 09 Engineering
  • 06 Biological Sciences
 

Citation

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Joines, W. T., & Blackman, C. F. (1980). Power density, field intensity, and carrier frequency determinants of RF-energy-induced calcium-ion efflux from brain tissue. Bioelectromagnetics, 1(3), 271–275. https://doi.org/10.1002/bem.2250010303
Joines, W. T., and C. F. Blackman. “Power density, field intensity, and carrier frequency determinants of RF-energy-induced calcium-ion efflux from brain tissue.Bioelectromagnetics 1, no. 3 (1980): 271–75. https://doi.org/10.1002/bem.2250010303.
Joines, W. T., and C. F. Blackman. “Power density, field intensity, and carrier frequency determinants of RF-energy-induced calcium-ion efflux from brain tissue.Bioelectromagnetics, vol. 1, no. 3, 1980, pp. 271–75. Pubmed, doi:10.1002/bem.2250010303.
Journal cover image

Published In

Bioelectromagnetics

DOI

ISSN

0197-8462

Publication Date

1980

Volume

1

Issue

3

Start / End Page

271 / 275

Location

United States

Related Subject Headings

  • Radio Waves
  • Electromagnetic Fields
  • Chickens
  • Calcium
  • Brain
  • Biophysics
  • Animals
  • 17 Psychology and Cognitive Sciences
  • 09 Engineering
  • 06 Biological Sciences