Abstract
The skin tissue of a human head can play an electromagnetic shielding role in protecting the central organs from microwave exposure. For the electrical properties, however, the publication data are being widely scattered from fat (low water content) to muscle (high water content), and thus various electrical properties of the skin tissue are used for SAR calculations in a heterogeous head model. This paper examines numerically how variations in electrical properties of the skin tissue have an effect on the SAR in a human head. Skin tissue properties are newly estimated from a Debye equation with two relaxation time constants, which are used to calculate the SAR in an our developed heterogeous head model for 1.5-GHz microwave exposure. The SAR details are compared with the following cases: the results computed for the skin tissue having the same electrical properties as those of fat, our previously obtained results and the results computed for the Furse's tissue properties. The effects of tissue mass densities on the SAR calculation are also examined.
