THERMAL EFFECTS IN HUMAN EXPOSURE TO MICROWAVES

摘要

Radiofrequency exposure guidelines and standards for localized human exposures state averaging specific (energy) absorption rate (SAR) over a mass of tissue. Cubic volumes with mass of 1 or 10 g (sides of approximately 1.0 or 2.1 cm, respectively) have been recommended. Averaging volume becomes important for exposures near the radiofrequency (RF) source at high frequencies with low depth penetration. Controversy exists because averaging the volume at 10 g permits higher SAR peak than at 1g. Assuming that temperature has the major effect on biological tissue, we estimate average temperatures over 1 and 10 g in a simplified head geometry, to give quantitative comparation criteria between the two measuring methods.