By Robert C. Kane
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The presence of nonuniform energy absorption that treated the new type of "hot spot" was initially characterized by H. P. 60 The "hot spots" Schwan discussed were somewhat different from those we have considered previously. In the earlier consideration of "hot spots" the focus was on nonuniform radiation, nonuniform absorption characteristics, and nonuniformities within the head. But this researcher performed experiments using various diameter head models. His conclusions are that as head diameter is reduced energyabsorbing "hot spots" become pronounced.
Industry researchers acknowledge the need for concern of operator exposure to radiofrequency radiation because the 800-900 MHz band is very close to the frequencies used for medical diathermy (918 MHz). Diathermy applicators are well known for efficiently depositing energy deep within human tissue. They propose that the energy penetrates deep and causes "hot spot" absorption at about one inch below the surface of the temporal bone. Other researchers have confirmed that curvatures of the head will lead to various "hot spots" and that some of the "hot spots" are strikingly pronounced.
2 (February 1971):205-14. ' 54 . C. , "Thermographic and Behavioral Studies of Rats in the Near Field of 918-MHz Radiations," IEEE Transactions on Microwave Theory and Techniques MTT-25, no. 10 (October 1977):833-36. - 44 proposed that, even at low absorption levels microscopic “hot spot" destruction may be occurring unnoticed. 1 mW/cm² average power density resulted in 140 mW/g "hot spots" in radiated animals. 09 mW/g, this latest finding indicates the presence of "hot spots" with enhancement of more than 1,500 times the expected level.
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