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PARTIAL-BODY AND WHOLE-BODY AVERAGE SPECIFIC ABSORPTION RATE (SAR) FOR A HOMOGENEOUS MODEL OF HUMAN

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This foundational SAR research established how human bodies absorb RF energy, forming the basis for today's wireless device safety limits.

Plain English Summary

Summary written for general audiences

This technical report analyzed how radiofrequency electromagnetic fields are absorbed by the human body, measuring Specific Absorption Rate (SAR) for both partial-body and whole-body exposure scenarios. The research used mathematical models to calculate how much RF energy different parts of the body absorb at various frequencies. This type of analysis forms the foundation for understanding how wireless devices and other RF sources affect human tissue.

Why This Matters

This research represents fundamental work in understanding how our bodies absorb electromagnetic energy from wireless devices and other RF sources. SAR measurements like these became the basis for regulatory limits on cell phones, WiFi routers, and other wireless technologies we use daily. The distinction between partial-body and whole-body SAR is crucial because it helps explain why localized exposures from devices held close to the body can create hotspots of energy absorption that exceed what whole-body averages might suggest.

What this means for you is that the SAR values listed on your smartphone represent calculations rooted in this type of foundational research. However, these models typically assume adult male anatomy and may not accurately reflect absorption patterns in children, whose smaller heads and thinner skulls can lead to deeper RF penetration and higher actual SAR values than regulatory testing suggests.

Exposure Details

Power Density
1 mW/cm²

Exposure Context

This study used 1 mW/cm² for radio frequency:

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1 mW/cm²Extreme Concern - 1,000 µW/m²FCC Limit - 10M µW/m²Effects observed in the Extreme Concern range (Building Biology)This level is 1 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 10 MHz to 500 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 10 MHz to 500 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

FIGURE VI-1. PARTIAL-BODY AND WHOLE-BODY AVERAGE SPECIFIC ABSORPTION RATE (SAR)* FOR ACHOMOGENEGYS M...

Cite This Study
Unknown (n.d.). PARTIAL-BODY AND WHOLE-BODY AVERAGE SPECIFIC ABSORPTION RATE (SAR) FOR A HOMOGENEOUS MODEL OF HUMAN.
Show BibTeX
@article{partial_body_and_whole_body_average_specific_absorption_rate_sar_for_a_homogeneo_g5331,
  author = {Unknown},
  title = {PARTIAL-BODY AND WHOLE-BODY AVERAGE SPECIFIC ABSORPTION RATE (SAR) FOR A HOMOGENEOUS MODEL OF HUMAN},
  year = {n.d.},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

SAR (Specific Absorption Rate) measures how much radiofrequency energy human tissue absorbs, typically expressed in watts per kilogram. It quantifies the rate at which electromagnetic fields deposit energy in biological tissue, helping assess potential heating effects.
Partial-body SAR measures localized energy absorption from devices like cell phones held near the head, while whole-body SAR measures total body exposure. Localized exposures can create energy hotspots significantly higher than whole-body averages suggest.
Homogeneous models treat the human body as having uniform electrical properties throughout, simplifying calculations but potentially missing important variations. Real bodies have different absorption rates in muscle, bone, brain tissue, and other organs.
Based on the RF designation and historical context, this research likely covered frequencies relevant to wireless communications, broadcasting, and emerging technologies of the era, potentially ranging from MHz to low GHz frequencies.
This foundational work established the mathematical framework for calculating SAR values that regulatory agencies still use today to set exposure limits for cell phones, WiFi devices, and other wireless technologies we use daily.