Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Frequency-Dependent Absorption of Electromagnetic Energy in Biological Tissue.
Author Joines, W. T. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. Experimental Biology Div.
Year Published 1984
Report Number EPA-600/J-84-023;
Stock Number PB84-201920
Additional Subjects Electromagnetic radiation ; Absorption ; Tissues(Biology) ; Neoplasms ; Reprints ; Bioaccumulation
Library Call Number Additional Info Location Last
NTIS  PB84-201920 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 6p
The frequency-dependent absorption of electromagnetic energy in biological tissue is illustrated by use of the Debye equations, model calculations for different irradiation conditions, and measured electrical properties (conductivity and permittivity) of different tissues. Four separate irradiation conditions are treated for calculating the power absorbed in a given tissue when it forms a flat interface or is surrounded by another tissue. The calculations show that the greatest differential absorption occurs at frequencies between the dominant relaxation frequencies in the two tissues. From rat mammary gland tumor data, the calculations show an optimum frequency range of about 100-500 MHz for microwave hyperthermia treatment of at least these types of tumor.