Abstract:
:This study reports measurements of the skin surface temperature elevations during localized irradiation (94 GHz) of three species: rat (irradiated on lower abdomen), rhesus monkey (posterior forelimb), and human (posterior forearm). Two exposure conditions were examined: prolonged, low power density microwaves (LPM) and short-term, high power density microwaves (HPM). Temperature histories were compared with calculations from a bio-heat transfer model. The mean peak surface temperature increase was approximately 7.0 degrees C for the short-term HPM exposures for all three species/locations, and 8.5 degrees C (monkey, human) to 10.5 degrees C (rat) for the longer-duration LPM exposures. The HPM temperature histories are in close agreement with a one-dimensional conduction heat transfer model with negligible blood flow. The LPM temperature histories were compared with calculations from the bio-heat model, evaluated for various (constant) blood flow rates. Results suggest a variable blood flow model, reflecting a dynamic thermoregulatory response, may be more suited to describing skin surface temperature response under long-duration MMW irradiation.
journal_name
Health Physjournal_title
Health physicsauthors
Nelson DA,Walters TJ,Ryan KL,Emerton KB,Hurt WD,Ziriax JM,Johnson LR,Mason PAdoi
10.1097/00004032-200305000-00006keywords:
subject
Has Abstractpub_date
2003-05-01 00:00:00pages
608-15issue
5eissn
0017-9078issn
1538-5159journal_volume
84pub_type
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