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Long-Wavelength Analysis of Plane Wave Irradiation of a Prolate Spheroid Model of Man

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Carl H. Durney, Curtis C. Johnson, Habib Massoudi · 1975

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Body orientation dramatically affects how much microwave radiation you absorb from electromagnetic field sources.

Plain English Summary

Summary written for general audiences

This 1975 study used mathematical modeling to analyze how microwave radiation penetrates and is absorbed by a prolate spheroid (egg-shaped object) representing the human body. The research found that power absorption patterns change dramatically depending on how the body is oriented relative to the electromagnetic field source.

Why This Matters

This foundational study established critical principles about how our bodies absorb microwave radiation that remain relevant today. The finding that orientation matters significantly for absorption patterns helps explain why exposure assessments can be so complex. When you hold a phone to your head versus carry it in your pocket, the absorption patterns differ substantially. This research laid groundwork for understanding that EMF exposure isn't uniform throughout the body - certain orientations and body positions can concentrate electromagnetic energy in specific regions. While this was theoretical modeling from nearly 50 years ago, these principles directly inform modern safety standards and explain why device positioning matters for your exposure levels.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Carl H. Durney, Curtis C. Johnson, Habib Massoudi (1975). Long-Wavelength Analysis of Plane Wave Irradiation of a Prolate Spheroid Model of Man.
Show BibTeX
@article{long_wavelength_analysis_of_plane_wave_irradiation_of_a_prolate_spheroid_model_o_g4159,
  author = {Carl H. Durney and Curtis C. Johnson and Habib Massoudi},
  title = {Long-Wavelength Analysis of Plane Wave Irradiation of a Prolate Spheroid Model of Man},
  year = {1975},
  
  
}

Quick Questions About This Study

The study found significant differences in power absorption depending on how the body-shaped model was oriented relative to the electromagnetic field source. Different positions concentrate energy in different body regions.
A prolate spheroid is an egg-shaped mathematical model used to approximate the human body's overall shape for electromagnetic calculations, allowing researchers to study radiation absorption patterns theoretically.
Long wavelength analysis applies when the electromagnetic waves are much longer than the object being studied, which was appropriate for modeling how microwave radiation interacts with the human body.
Plane wave irradiation refers to electromagnetic waves traveling in parallel rays from a distant source, similar to how you might be exposed to broadcast antennas or other far-field radiation sources.
This foundational research established principles about body orientation and absorption patterns that still inform how we understand EMF exposure from cell phones, WiFi, and other microwave-frequency devices today.