Abstract

Overview

The study evaluates the electromagnetic exposure of an 8-year-old child in proximity to a femtocell, a small cellular base station, within an indoor environment. The research employs advanced mathematical modeling to estimate potential exposure levels.

Methodology

• The operational frequency of the femtocell was 2600 MHz.
• Both the child and femtocell were freely located at random positions within the room.
• Stochastic dosimetry and sparse low-rank tensor approximation methods (sparse LRA) were applied to develop surrogate models for exposure estimation.

Findings

The results indicate that regardless of their positions within the room:

• The specific absorption rate (SAR) measured was considerably below the safety thresholds set by the International Commission of Non-Ionizing Radiation Protection (ICNIRP).
• The likelihood of reaching SAR levels above 1% of ICNIRP guidelines was less than 0.006.
• Distance variation between the child and the femtocell significantly affected exposure levels, with dispersion values consistently above 48%.

Conclusion

The study confirms that electromagnetic exposure from femtocells in indoor environments is significantly below international safety guidelines, although distancing measures can affect exposure intensity. This underscores the importance of forward-thinking spatial arrangements to minimize potential risks.