| Autor: |
E. P. Khizhnyak, M. C. Ziskin |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Radio Frequency Radiation Dosimetry and Its Relationship to the Biological Effects of Electromagnetic Fields ISBN: 9780792364054 |
| DOI: |
10.1007/978-94-011-4191-8_22 |
| Popis: |
Distribution of 800-1500 MHz and 37-78 GHz microwave absorption in biological tissue phantoms and real biological objects was studied using method of Infrared Thermography. Multicomponent and 0.1-0.2 mm thin-layer phantoms were irradiated in near and far field of radiating antennas. SAR distribution was calculated as the function of initial heating rate. Temperature sensitivity was better than 0.02 K at up to 60 frames per second sampling rate. It was found that nonuniform SAR distribution could appear in near field area due to a geometrical resonance resulting from a secondary wave-mode interaction between an irradiated object and the corresponding critical cross-section of the horn antennas, and due to the biological heterogeneity. Local SAR in hot-spots can significantly exceed the spatially averaged values. These findings provide an explanation for a number of frequency-dependent and for so-called non-thermal effects of microwaves. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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