Thermal Analysis Complementary to Standardized Experimental Dosimetry of SAR in Human Head

Abstract

Overview

Intensive and prolonged usage of cellular phones (CPs) can lead to concerning side-effects such as hyperthermia, primarily through direct electromagnetic field exposure and thermal contact with the ear. This study aims to assess these effects using a detailed experimental analysis.

Methodology

• Use of biologically-equivalent fluids in phantom heads to mimic human tissue in experiments measuring the "specific energy absorption rate" (SAR).
• Complementary numerical experiments designed to enhance the accuracy of predictions regarding SAR levels and thermal load.

Findings

A numerical model of a human head alongside a radiation source has been utilized for experiments. This model adheres to electromagnetic dosimetry standards and helps extend the understanding from limited experimental outputs.

The study emphasizes the combined effect of energy absorbed through SAR and direct thermal contact from heated CP devices, which contributes to temperature rise.

Conclusion

Results from a numerical analysis on a standardized phantom head model demonstrate significant non-uniform temperature distributions and slight increases in local "hot spots" temperatures, pointing towards potential discomfort during prolonged phone use. The findings underscore the reality of the cumulative effect from both heat sources, influenced by power emission and device complexity.

Important Considerations

Although studies are based on simplified models, the noted bio-thermal effects mimic those felt during real use, highlighting a need for careful consideration in human protection and device certification standards.