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

Journal Article · Tue Jan 01 00:00:00 EST 1980 · Bioelectromagnetics (N.Y.); (United States)

OSTI ID:5498339

Joines, W T; Blackman, C F

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.

• OSTI ID: 5498339
• Journal Information: Bioelectromagnetics (N.Y.); (United States), Vol. 1:3
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
59 BASIC BIOLOGICAL SCIENCES
BRAIN
BIOCHEMISTRY
RADIOWAVE RADIATION
BIOLOGICAL EFFECTS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL MODELS
CALCIUM IONS
CHICKENS
ELECTROMAGNETIC FIELDS
FREQUENCY DEPENDENCE
POWER DENSITY
ANIMALS
BIRDS
BODY
CENTRAL NERVOUS SYSTEM
CHARGED PARTICLES
CHEMISTRY
ELECTROMAGNETIC RADIATION
FOWL
IONS
KINETICS
NERVOUS SYSTEM
ORGANS
RADIATIONS
REACTION KINETICS
VERTEBRATES
560400* - Other Environmental Pollutant Effects
550200 - Biochemistry