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Part‐body and multibody effects on absorption of radio‐frequency electromagnetic energy
Author(s) -
Gandhi O. P.,
Hagmann M. J.,
D'Andrea J. A.
Publication year - 1979
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs014i06sp00015
Subject(s) - antenna (radio) , resonance (particle physics) , absorption (acoustics) , head (geology) , electromagnetic field , deposition (geology) , physics , energy (signal processing) , radio frequency , radio wave , specific absorption rate , computational physics , atomic physics , nuclear magnetic resonance , acoustics , telecommunications , geology , computer science , quantum mechanics , paleontology , geomorphology , sediment
Fine structure in the whole‐body resonant curve for radio‐frequency energy deposition in man can be attributed to part‐body resonances. As for head resonance, which occurs near 350 MHz in man, the absorptive cross section is nearly three times the physical cross section of the head. The arm has a prominent resonance at 150 MHz. Numerical solutions, antenna, theory, and experimental results on animals have shown that whole‐body energy deposition may be increased by 50 percent or more because of multiple bodies that are strategically located in the field. Empirical equations for SARs are also presented along with test data for several species of laboratory animals. Barbiturate anesthesia is sufficiently disruptive of thermoregulation that Δ T s of colonie temperature yield energy dose values in several mammals that compare quite favorably with those based on whole‐body calorimetry.