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NEAR FIELD IRRADIATION OF PROLATE SPHEROIDAL MODELS OF HUMANS

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M. F. Iskander, P. W. Barber, C. H. Durney, H. Massoudi · 1978

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Near-field EMF exposure creates different radiation patterns and higher energy absorption than distant sources, challenging standard safety models.

Plain English Summary

Summary written for general audiences

This 1978 study analyzed how electromagnetic radiation from short dipole antennas affects human-shaped models at close distances. Researchers found that radiation patterns and energy absorption rates (SAR) differ significantly from distant exposure, with higher energy densities occurring when the source is less than half a wavelength away from the body.

Why This Matters

This foundational research reveals a critical gap in how we understand EMF exposure in our daily lives. Most safety standards are based on far-field radiation patterns, but this study demonstrates that close-proximity exposure creates entirely different energy absorption patterns in the human body. The reality is that we're constantly exposed to near-field radiation from devices we hold against our bodies or keep in our pockets. The oscillating SAR values and higher energy densities found at close distances suggest our current safety models may be inadequate for real-world exposure scenarios. This research laid important groundwork for understanding why proximity matters so much with EMF-emitting devices, yet decades later, we still see safety testing that doesn't fully account for these near-field effects.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
M. F. Iskander, P. W. Barber, C. H. Durney, H. Massoudi (1978). NEAR FIELD IRRADIATION OF PROLATE SPHEROIDAL MODELS OF HUMANS.
Show BibTeX
@article{near_field_irradiation_of_prolate_spheroidal_models_of_humans_g4564,
  author = {M. F. Iskander and P. W. Barber and C. H. Durney and H. Massoudi},
  title = {NEAR FIELD IRRADIATION OF PROLATE SPHEROIDAL MODELS OF HUMANS},
  year = {1978},
  
  
}

Quick Questions About This Study

Near field radiation occurs when you're very close to an EMF source (less than half a wavelength away). Unlike distant exposure, the electromagnetic fields behave differently and create higher energy densities in nearby objects, including human tissue.
Prolate spheroids are elongated oval shapes that approximate the human body form for electromagnetic modeling. Researchers use these simplified geometric models to calculate how EMF radiation interacts with and penetrates human tissue without complex anatomical details.
At distances less than 0.5 wavelengths, the electromagnetic fields create interference patterns that cause specific absorption rate (SAR) values to fluctuate rather than decrease smoothly. This creates unpredictable energy absorption hotspots in nearby tissue.
EBCM is a mathematical technique used to solve complex electromagnetic problems involving curved surfaces like the human body. It calculates how electromagnetic fields scatter and penetrate when they encounter biological tissues with different electrical properties.
At close distances (under 0.5 wavelengths), both electric and magnetic energy densities become significantly higher than the average radiation power density. This means tissues absorb more energy than distant-field calculations would predict.