Analyzing the SAR in Human Head Tissues under Different Exposure Scenarios

Abstract

Overview

This study focuses on the assessment of the induced specific absorption rate (SAR) in various human models under different exposure scenarios. The research employs both laboratory measurements and simulations to analyze SAR values.

Findings

• Initial laboratory measurements were made at frequencies of 900 MHz and 1800 MHz using a standardized SAR laboratory and a phantom setup. Computations were made using a specific anthropomorphic mannequin (SAM) and a computer simulation technology (CST) program.
• Subsequent simulations evaluated average SAR for the head and specific head tissues such as the brain, muscles, and fat across different models representing a range of genders, ages, and tissue types.
• The findings show significantly higher SAR values at 1800 MHz compared to 900 MHz, with notable differences among various human models. The maximum SAR change ratio in the brain compared to the head surfaces at 4.44 for the male at 1800 MHz.
• Despite the electromagnetic field levels being below the general public local exposure reference levels, some local SAR values exceeded the basic restrictions set by the International Commission of Non-Ionizing Radiation Protection, particularly at 1800 MHz.

Conclusion

The study underlines the importance of continual research into the impacts of RF-EMF exposure from wireless technologies, focusing specifically on differing SAR impacts across age, gender, and tissue types. It calls for the establishment of refined safety standards and heightened public awareness given the potential health risks associated with such exposures.