The effects of RF absorbers on exposure levels at 100 MHz
| Autor: | Stewart J. Allen, Kevin S. Mylacraine |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Anechoic chamber
Radio Waves Physiology Rf exposure Biophysics Models Biological Whole-Body Counting Absorption law.invention Corner reflector Nuclear magnetic resonance Optics law Seated Positions Humans Dosimetry Radiology Nuclear Medicine and imaging Dipole antenna Microwaves Bioelectromagnetics Physics Phantoms Imaging business.industry Transmitter General Medicine business Whole-Body Irradiation |
| Zdroj: | Bioelectromagnetics. 28:406-408 |
| ISSN: | 1521-186X 0197-8462 |
| DOI: | 10.1002/bem.20309 |
| Popis: | The study presented in this article was designed to complete a dosimetry protocol required to establish the RF exposure levels at 100 MHz for measurement of the effect on cognition in human volunteers near the resonant frequency in seated positions. The results are compared with those reported previously using the same experimental procedures, except with the vertically radiating dipole antenna and corner reflector raised by .30 m to the vertical center of the anechoic chamber. The average whole body SAR for the high and low SAR conditions used in the previous study was achieved with a 12% increase in transmitter forward power. However, the incident power density averaged over the body was increased by 42%, from 40 and 80 W/m2 in the previous study to 57 and 113 W/m2 in the current study to achieve the same whole body average SAR used in the previous study. The differences in field patterns and field intensities between the previous and current studies were introduced by interactions between the E-field and RF absorbers in the floor and ceiling, which represent resonant structures at 100 MHz. Bioelectromagnetics 28:406–408, 2007. © 2007 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text