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SAR / Device Absorption

Analysis of three-dimensional SAR distributions emitted by mobile phones in an epidemiological perspective.

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Deltour I, Wiart J, Taki M, Wake K, Varsier N, Mann S, Schüz J, Cardis E. · 2011

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Mobile phones with similar designs can produce vastly different radiation patterns in your brain, making exposure harder to predict.

Plain English Summary

Summary written for general audiences

Researchers analyzed how mobile phone radiation (SAR) spreads through the head using 120 different phones across multiple frequency bands (800-1800 MHz). They found that phones with similar external features don't necessarily produce similar radiation patterns in the brain, making it difficult to predict exposure levels based on phone appearance alone. This research was conducted to help improve large-scale health studies like Interphone that investigate links between mobile phone use and brain cancer.

Why This Matters

This study reveals a critical challenge in EMF health research: you can't judge a phone's radiation pattern by its cover. The researchers found that external phone characteristics like shape and antenna placement don't reliably predict how radiofrequency energy distributes through brain tissue. This matters because epidemiological studies trying to link phone use to health effects need accurate exposure assessments, not rough approximations based on phone models. The reality is that SAR patterns are complex and variable, even among phones that look similar or operate on the same frequencies. What this means for you is that relying on phone specifications or external features to gauge your EMF exposure isn't sufficient. The science demonstrates that radiation absorption patterns are more individualized than previously assumed, which makes personal protection strategies even more important than waiting for population-level studies to provide definitive answers.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.80 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.80 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 800, 900, 1500 and 1800 MHz

Study Details

The three-dimensional distribution of the specific absorption rate of energy (SAR) in phantom models was analysed to detect clusters of mobile phones producing similar spatial deposition of energy in the head.

The clusters' characteristics were described from the phones external features, frequency band and c...

Each phone's measurements were summarised by the half-ellipsoid in which the SAR values were above h...

Cite This Study
Deltour I, Wiart J, Taki M, Wake K, Varsier N, Mann S, Schüz J, Cardis E. (2011). Analysis of three-dimensional SAR distributions emitted by mobile phones in an epidemiological perspective. Bioelectromagnetics. 32(8):634-643, 2011.
Show BibTeX
@article{i_2011_analysis_of_threedimensional_sar_2026,
  author = {Deltour I and Wiart J and Taki M and Wake K and Varsier N and Mann S and Schüz J and Cardis E.},
  title = {Analysis of three-dimensional SAR distributions emitted by mobile phones in an epidemiological perspective.},
  year = {2011},
  doi = {10.1002/bem.20684},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/bem.20684},
}
DOI: 10.1002/bem.20684

Cited By (13 papers)

View all 13 citing papers on Semantic Scholar

Quick Questions About This Study

No, phone design doesn't predict brain radiation patterns. A 2011 study of 120 phones found that similar-looking devices produced very different radiation distributions in the head, making it impossible to judge exposure levels based on appearance alone.
You cannot determine phone radiation levels by appearance. Research analyzing 120 different phones across multiple frequencies found no relationship between external phone characteristics and actual radiation patterns created inside brain tissue during use.
Flip phones and bar phones show only weak radiation pattern differences in specific positions. A comprehensive study found phone shape has minimal impact on brain radiation distribution, with individual phone models varying significantly regardless of design type.
SAR levels vary significantly even between similar-looking phones. Scientists tested 120 phones and discovered that external features don't predict radiation patterns in the brain, meaning identical-appearing devices can produce very different exposure levels.
Phone frequency bands (800-1800 MHz) create different radiation patterns in brain tissue. However, researchers found that frequency alone doesn't determine exposure patterns - individual phone design variations matter more than the specific frequency band used.