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SAR / Device Absorption

Comparison of radio frequency energy absorption in ear and eye region of children and adults at 900, 1800 and 2450 MHz.

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Keshvari J, Lang S. · 2005

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The study found that differences in RF energy absorption between children and adults are more likely due to head anatomy and geometry than to age.

Plain English Summary

Summary written for general audiences

Researchers used the finite-difference time-domain (FDTD) computational method to calculate specific absorption rate (SAR) in anatomically correct adult and child head models exposed to a half-wave dipole at 900, 1800, and 2450 MHz. The ear and eye regions were studied because they represent realistic exposure scenarios for mobile wireless communication devices.

Why This Matters

The objective of the study was to clarify possible differences in RF energy absorption in the head region of children and adults using computational techniques. The head models differed greatly in size, external shape, and internal anatomy, while the same tissue dielectric parameters were applied to all models. Four MRI-based head models were used: one female adult, one adult, and two child models aged 3 and 7 years. The differences in absorption were compared with the maximum energy absorption of the head model.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 900, 1800 and 2450 MHz

Study Details

The objective of this study was to clarify possible differences in RF energy absorption in the head region of children and adults using computational techniques.

Using the finite-difference time-domain (FDTD) computational method, a set of specific absorption ra...

The head models greatly differ from each other in terms of size, external shape and the internal ana...

It seems that the external shape of the head and the distribution of different tissues within the head play a significant role in the RF energy absorption.

Cite This Study
Keshvari J, Lang S. (2005). Comparison of radio frequency energy absorption in ear and eye region of children and adults at 900, 1800 and 2450 MHz. Phys Med Biol. 50(18):4355-4369, 2005.
Show BibTeX
@article{j_2005_comparison_of_radio_frequency_2274,
  author = {Keshvari J and Lang S.},
  title = {Comparison of radio frequency energy absorption in ear and eye region of children and adults at 900, 1800 and 2450 MHz.},
  year = {2005},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/16148398/},
}
PubMed: 16148398

Cited By (66 papers)

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Quick Questions About This Study

The objective was to clarify possible differences in RF energy absorption in the head region of children and adults using computational techniques.
The finite-difference time-domain (FDTD) method was used to perform SAR calculations for anatomically correct adult and child head models.
A half-wave dipole was used as an exposure source at 900, 1800, and 2450 MHz frequencies.
The ear and eye regions were studied because they represent realistic exposure scenarios to current and upcoming mobile wireless communication devices.
Four MRI-based head models were used: one female adult, one adult, and two child models aged 3 and 7 years.