Abstract

Overview

The growing evidence of increased magnetite nanoparticles both endo- and exo-genic in the human brain underscores the critical need for a comprehensive assessment of power deposition when electromagnetic waves at GHz frequencies interact with such tissues.

Context

This frequency range is common among widely-used portable communication devices that emit radiation close to a human's head, highlighting potential health risks.

Technical Limitations

• Current dosimetric numerical codes fail to accurately compute the magnetic losses at these frequencies.
• The inconsistency arises due to the absence of computational algorithms that integrate Maxwell and Landau-Lifshitz-Gilbert equations for magneto-dielectrics, which take into account eddy currents losses and specific properties of magnetic sub-millimetric particles.

Findings

The study focuses on the limitations and inaccuracies of using commercial dosimetric numerical software to analyze the total absorbed power in brain models containing ferrimagnetic content exposed to 3.5GHz electromagnetic waves.

Computations using Polder’s permeability tensor as constitutive relation resulted in unreliable outcomes, thus stressing the potential underestimated risks to human health from electromagnetic fields.

Conclusion

While existing software offers a preliminary view of the electromagnetic effect of ultra- and super-high frequencies on magnetic-dielectric tissues, there is a clear need for advanced computation methods to achieve reliable results and ensure safety.