Accession Number : ADA100029


Title :   Electromagnetic Energy Absorption and Its Distribution for Man and Animals at Different Frequencies under Various Conditions.


Descriptive Note : Final rept. 1974-1978,


Corporate Author : UTAH UNIV SALT LAKE CITY


Personal Author(s) : Gandhi,Om P ; D'Andrea,John A ; Hagmann,Mark J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a100029.pdf


Report Date : Nov 1978


Pagination or Media Count : 112


Abstract : The whole-body absorption of electromagnetic waves by biological bodies is strongly dependent on the orientation of the electric field (E) relative to the longest dimension (L) of the body. The highest rate of energy deposition occurs for E parallel L orientation for frequencies (65-70 MHz for an adult human being) such that the major length is approximately 0.36 to 0.4 times the free-space wavelength. Peaks of whole-body absorption for the other two configurations (major length oriented along the direction of propagation (K parallel L) or along the vector of the magnetic field (H parallel L) occur for wavelength on the order of 4 pi b, where 2 pi b is the weighted average circumference of the animals. Numerical calculations for a realistic block model of man shown a fine structure to whole-body absorption at frequencies higher than the whole-body resonant frequency. Minor peaks in the supraresonance region are ascribed to maxima of energy deposition in the various body parts such as the arm and the head. For the E parallel L, supraresonant region, an average 1/f dependence of the whole-body absorbed dose is obtained theoretically and experimentally to frequencies on the order of 4-8 times the resonance frequency.


Descriptors :   *ELECTROMAGNETIC RADIATION , *RADIATION EFFECTS , SIMULATION , COMPUTATIONS , HUMANS , NUMERICAL ANALYSIS , ORIENTATION(DIRECTION) , ELECTRIC FIELDS , THREE DIMENSIONAL , RESONANT FREQUENCY , BEHAVIOR , BIOLOGICAL ABSORPTION , ANATOMICAL MODELS , LABORATORY ANIMALS , WHOLE BODY IRRADIATION


Subject Categories : Radiobiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE