Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Power Density, Field Intensity, and Carrier Frequency Determinants of RF-Energy-Induced Calcium-Ion Efflux from Brain Tissue.
Author Joines, William T. ; Blackman, Carl F. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC.
Year Published 1980
Report Number EPA-600/J-80-310;
Stock Number PB81-230914
Additional Subjects Brain ; Radiofrequencies ; Tissues(Biology) ; Field strength ; Carrier frequencies ; Reprints ; Calcium ion efflux
Library Call Number Additional Info Location Last
NTIS  PB81-230914 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 5p
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 remain 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 regative 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.