8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Whole Body / General

COMPARISON OF THEORETICAL AND EXPERIMENTAL ABSORPTION OF RADIOFREQUENCY POWER

Bioeffects Seen

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

Share:

Mathematical models for predicting RF absorption in human bodies were validated, establishing foundations still used in modern wireless safety calculations.

Plain English Summary

Summary written for general audiences

This 1975 study compared computer calculations with actual measurements of how radiofrequency energy (10-50 MHz) is absorbed by human and monkey bodies. Researchers found that prolate spheroid mathematical models accurately predicted RF absorption in test phantoms, but ellipsoid models better represented the actual shape of living bodies.

Why This Matters

This foundational research established critical methods for measuring how RF energy penetrates biological tissues - work that remains essential today as we grapple with exponentially higher exposures from wireless devices. The study's 10-50 MHz frequency range covers AM radio and some industrial heating applications, frequencies we encounter daily but rarely consider. What makes this research particularly significant is its demonstration that body shape matters enormously in RF absorption patterns. The finding that ellipsoid models better approximate real biological systems helped establish the mathematical foundations used in modern SAR (Specific Absorption Rate) calculations. This is the same science that determines the safety limits printed in your phone's fine print - limits that haven't been meaningfully updated since this era despite our dramatically changed exposure landscape.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Stewart J. Allen, Carl H. Durney, Curtis C. Johnson, Habib Massoudi (1975). COMPARISON OF THEORETICAL AND EXPERIMENTAL ABSORPTION OF RADIOFREQUENCY POWER.
Show BibTeX
@article{comparison_of_theoretical_and_experimental_absorption_of_radiofrequency_power_g5882,
  author = {Stewart J. Allen and Carl H. Durney and Curtis C. Johnson and Habib Massoudi},
  title = {COMPARISON OF THEORETICAL AND EXPERIMENTAL ABSORPTION OF RADIOFREQUENCY POWER},
  year = {1975},
  
  
}

Quick Questions About This Study

The study examined radiofrequency absorption at 10-50 MHz, covering AM radio frequencies and some industrial heating applications. These frequencies are lower than modern cell phones but helped establish fundamental principles for RF dosimetry calculations.
Monkey phantoms provided a biological model similar to humans for validating mathematical calculations of RF absorption. The researchers needed to test whether their computer models accurately predicted real-world energy absorption patterns in living tissue.
A prolate spheroid is an oval mathematical shape (like a football) used to approximate the human body for calculating RF absorption. While these models worked well for calculations, the study found ellipsoid shapes better matched actual human anatomy.
The theoretical calculations showed excellent agreement with experimental data from test phantoms. This validation was crucial for establishing confidence in mathematical models used to predict how RF energy interacts with biological tissues.
Different body shapes absorb RF energy differently because electromagnetic fields interact with the geometry of biological tissues. The study showed that using more anatomically accurate ellipsoid models improved predictions compared to simpler spheroid approximations.