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SAR / Device Absorption

Impact of head morphology on local brain specific absorption rate from exposure to mobile phone radiation.

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Adibzadeh F, Bakker JF, Paulides MM, Verhaart RF, van Rhoon GC. · 2014

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Individual head anatomy causes mobile phone radiation absorption to vary up to 16-fold between people, making standard safety tests inadequate.

Plain English Summary

Summary written for general audiences

Researchers used computer models to study how mobile phone radiation is absorbed in the brains of 20 different people with varying head shapes and sizes. They found that radiation absorption (called SAR) varied dramatically between individuals - up to 16 times higher in some people compared to others, depending on their unique head anatomy. This means current safety testing, which uses only standard dummy heads, may not accurately predict radiation exposure for real people with different head shapes.

Why This Matters

This research exposes a fundamental flaw in how we assess mobile phone safety. The science demonstrates that using generic head models - the current industry standard - creates massive blind spots in our understanding of individual radiation exposure. When absorption rates can vary by more than 16-fold between real people, it means some individuals may be receiving far higher doses than safety tests suggest. What this means for you is that current SAR ratings on phones represent averages that may not reflect your personal exposure level. The reality is that your head size, shape, and tissue composition all influence how much radiation your brain absorbs during calls. This variability helps explain why some people may be more susceptible to EMF-related health effects than others, and why population-wide studies sometimes show mixed results.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.90 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.90 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 835 and 1900 MHz

Study Details

In this study, we performed detailed dosimetric simulations for 20 head models and quantified the variation of RF dose in different brain regions as a function of head morphology

Head models were exposed to RF fields from generic mobile phones at 835 and 1900 MHz in the "tilted"...

The results show that the variation in the averaged SAR among the heads can reach up to 16.4 dB at a...

In conclusion, we show head morphology as an important uncertainty source for dosimetric studies of mobile phones. Therefore, any dosimetric analysis dealing with RF dose at a specific region in the brain (e.g., tumor risk analysis) should be based upon real morphology.

Cite This Study
Adibzadeh F, Bakker JF, Paulides MM, Verhaart RF, van Rhoon GC. (2014). Impact of head morphology on local brain specific absorption rate from exposure to mobile phone radiation. Bioelectromagnetics. 2014 Nov 15. doi: 10.1002/bem.21885.
Show BibTeX
@article{f_2014_impact_of_head_morphology_1806,
  author = {Adibzadeh F and Bakker JF and Paulides MM and Verhaart RF and van Rhoon GC.},
  title = {Impact of head morphology on local brain specific absorption rate from exposure to mobile phone radiation.},
  year = {2014},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/25399806/},
}
PubMed: 25399806

Cited By (21 papers)

Quick Questions About This Study

Yes, head shape dramatically affects how much cell phone radiation your brain absorbs. A 2014 study found that radiation absorption varied up to 16 times between people with different head shapes and sizes, meaning current safety testing may not accurately reflect real-world exposure for many individuals.
Research shows cell phone radiation absorption varies dramatically between individuals based on head anatomy. Some people absorb up to 16 times more radiation than others when using the same phone, suggesting current one-size-fits-all safety standards may inadequately protect certain populations with different head morphologies.
Mobile phone radiation affects brains differently depending on individual head shape and size. Computer modeling of 20 different people showed radiation absorption in brain tissue varied by up to 16-fold, with some anatomical features causing significantly higher exposure levels than standard safety testing predicts.
Brain radiation risks from phones may be underestimated for many people because safety testing uses standard dummy heads. Research found actual radiation absorption varies up to 16 times between individuals based on unique head anatomy, suggesting current safety limits don't account for this biological variation.
Phone radiation impacts different head shapes very differently. A study using computer models found that people with certain head anatomies absorb up to 16 times more radiation than others, particularly in sensitive brain regions like the medulla, challenging current safety testing methods.