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Adibzadeh F et al, (January 2015) Impact of head morphology on local brain specific absorption rate from exposure to mobile phone radiation, Bioelectromagnetics. 2015 Jan;36(1):66-76. doi: 10.1002/bem.21885

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Authors not listed · 2015

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Your head shape determines how much cell phone radiation you absorb - some people get 16 times more than others.

Plain English Summary

Summary written for general audiences

Researchers tested how different head shapes and sizes affect radiation absorption from cell phones using computer models of 20 different heads. They found dramatic variations in brain radiation exposure - up to 16 times higher in some people compared to others when using phones at the same power level. This suggests that standard safety testing using only generic head models may not protect everyone equally.

Why This Matters

This study exposes a critical flaw in how we assess cell phone safety. The science demonstrates that radiation absorption in your brain depends heavily on your individual head shape, size, and anatomy - yet safety standards rely on testing with just two generic head models. The reality is that some people may absorb 16 times more radiation than others from the same phone call. This massive variation means current safety limits, already based on outdated assumptions about heating effects, may leave many individuals inadequately protected. What this means for you is that the 'safe' exposure levels touted by regulators represent averages that don't account for your unique anatomy. Put simply, if you have a head shape that concentrates radiation more efficiently, you're getting a higher dose than the safety tests assumed.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 835 MHz, 1900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 835 MHz, 1900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2015). Adibzadeh F et al, (January 2015) Impact of head morphology on local brain specific absorption rate from exposure to mobile phone radiation, Bioelectromagnetics. 2015 Jan;36(1):66-76. doi: 10.1002/bem.21885.
Show BibTeX
@article{adibzadeh_f_et_al_january_2015_impact_of_head_morphology_on_local_brain_specific_absorption_rate_from_exposure_to_mobile_phone_radiation_bioelectromagnetics_2015_jan36166_76_doi_101002bem21885_ce624,
  author = {Unknown},
  title = {Adibzadeh F et al, (January 2015) Impact of head morphology on local brain specific absorption rate from exposure to mobile phone radiation, Bioelectromagnetics. 2015 Jan;36(1):66-76. doi: 10.1002/bem.21885},
  year = {2015},
  doi = {10.1002/bem.21885},
  
}
DOI: 10.1002/bem.21885PubMed: 25399806

Quick Questions About This Study

Head size, bone thickness, tissue density, and brain structure all affect how electromagnetic fields penetrate and concentrate in brain tissue. Smaller heads, thinner skulls, and certain anatomical features can focus radiation into hotspots, creating dramatically higher local absorption rates.
The study tested both frequencies and found significant absorption differences at each frequency depending on head morphology. Lower frequencies like 835 MHz generally penetrate deeper, while higher frequencies like 1900 MHz create more surface heating, but individual head shape affects both.
The medulla region showed up to 15.8 dB variation between different head types using anatomical mapping. When measured with cube-shaped sensors, some 1 cm³ brain areas showed even higher variations of 16.4 dB between individuals with different head morphologies.
Yes, both the cheek position (phone flat against face) and tilted position (phone angled) were tested, and head morphology affected radiation absorption patterns differently in each position. The specific absorption hotspots and intensity varied based on individual anatomy.
Regulatory testing uses only two standard head phantoms to represent all humans, which this research shows is inadequate. The massive 16-fold variation in absorption between different head types wasn't considered when establishing current safety limits for mobile phones.