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SAR / Device Absorption

Specific absorption rate variation in a brain phantom due to exposure by a 3G mobile phone: problems in dosimetry.

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Behari J, Nirala JP. · 2013

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Researchers developed a SAR measurement system for a brain phantom in a Perspex box, exposed it to a 3G mobile phone at 1718.5 MHz, and found SAR values sensitive to angular position but well below safety criteria.

Plain English Summary

Summary written for general audiences

A SAR measurement system was developed for a brain phantom in a Perspex box. The phantom box volume matched a small rat and was illuminated by a 3G mobile phone at 1718.5 MHz. A moving platform changed the phone's angular position at 2 degrees per minute up to 20 degrees while induced fields were measured. SAR values computed from induced fields were higher than those from induced field measurements alone and varied with angular position, but remained well below human safety criteria. SAR was also measured by temperature rise and compared with the induced-field results, and measurements were repeated in a 10 g phantom in a cubical box for safety criteria comparison.

Why This Matters

The authors suggest the data warrant a fresh look at electromagnetic field-bio interaction. The phone was lifted by a pulley driven by a stepper motor, and induced-field data from various locations were used to compute SAR and compare across positions. Results were also compared with measurements taken when the phone was placed horizontally relative to the animal.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.72 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.72 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 1718.5 MHz

Study Details

A specific absorption rate (SAR) measurements system has been developed for compliance testing of personal mobile phone in a brain phantom material contained in a Perspex box.

The volume of the box has been chosen corresponding to the volume of a small rat and illuminated by ...

These results are higher than those obtained with the knowledge of induced field measurements. It is...

The data are suggestive of having a fresh look to understand the mode of electromagnetic field -bio interaction.

Cite This Study
Behari J, Nirala JP. (2013). Specific absorption rate variation in a brain phantom due to exposure by a 3G mobile phone: problems in dosimetry. Indian J Exp Biol. 51(12):1079-1085, 2013.
Show BibTeX
@article{j_2013_specific_absorption_rate_variation_1893,
  author = {Behari J and Nirala JP.},
  title = {Specific absorption rate variation in a brain phantom due to exposure by a 3G mobile phone: problems in dosimetry.},
  year = {2013},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/24579373/},
}
PubMed: 24579373

Cited By (4 papers)

Quick Questions About This Study

The study measured induced fields in a brain phantom exposed to a mobile phone and computed SAR values from those fields.
The phone was mounted on a moving platform that changed its angular position at 2 degrees per minute up to 20 degrees, and results were compared with a horizontal phone position.
SAR values varied with the angular position of the phone, were higher than values derived from induced field measurements alone, and all values remained well below human safety criteria.
They also measured SAR by detecting temperature rise in the phantom and compared those results with the values computed from induced fields.
A Perspex box sized for a small rat was used for the brain phantom, and a cubical box containing 10 g of phantom material was used for safety criteria comparison.