EFFECTS OF MICROWAVES ON MANKIND
H. P. Schwan, Helmut Pauly, Joan Twisdom, I. Glazer · 1958
This 1958 research established fundamental principles of how microwaves interact with human tissues that still guide safety standards today.
Plain English Summary
This 1958 technical report examined how microwave radiation affects human tissues, focusing on dielectric properties and absorption patterns in organs like the brain, bone, and eye. The research investigated thermal loading and radiation absorption coefficients to understand how electromagnetic waves interact with different body tissues. This represents some of the earliest scientific work documenting microwave effects on human biology.
Why This Matters
This 1958 report represents foundational research into microwave effects on human tissues at a time when microwave technology was rapidly expanding. The focus on dielectric properties and absorption coefficients in critical organs like the brain and eye demonstrates early scientific recognition that different tissues respond differently to electromagnetic radiation. What makes this particularly relevant today is that the fundamental physics principles documented in this early work still govern how modern wireless devices interact with our bodies. The thermal loading patterns identified in 1958 remain the primary basis for current safety standards, yet we now know that biological effects can occur through non-thermal mechanisms that weren't fully understood at the time. This historical research reminds us that concerns about microwave radiation effects aren't new - scientists were documenting tissue interactions with electromagnetic fields decades before cell phones became ubiquitous.
Finding
The dielectric properties of brain tissue are easily understood in view of brain's composition if from a dielectric point of view a model is chosen which assumes the solid molecular components of brain, i.e. proteins and lipids, dissolved in a solution comparable with physiological saline solution.
In their words
“The dielectric properties of brain tissue are easily understood in view of brain's composition if from a dielectric point of view a model is chosen which assumes the solid molecular components of brain, i.e. proteins and lipids, dissolved in a solution comparable with physiological saline solution.”
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To determine the dielectric constant and conductance of brain, bone constituents, and various parts of the eye, and to evaluate the absorption coefficient of electromagnetic waves in these tissues over a broad frequency spectrum.
Dielectric constant and conductance measurements were conducted on brain tissue samples (16 samples)...
Dielectric properties of brain tissue show no large differences between gray and white matter. The d...
Bone and yellow marrow are weak absorbers compared to brain, making the human skull practically transparent up to 5000 Mc. Brain is subject to heat exposure at frequencies below 3000 Mc. to a larger extent than other tissues. Red bone marrow is subject to strong heat development in the frequency range from 3000 to 10,000 Mc. The human eye is subject to peak thermal load in the frequency range from 1000 to 5000 Mc., particularly at 3000 Mc. The lens is particularly sensitive to temperature rise due to its heat-sensitive proteins.
Show BibTeX
@article{effects_of_microwaves_on_mankind_g4026,
author = {H. P. Schwan and Helmut Pauly and Joan Twisdom and I. Glazer},
title = {EFFECTS OF MICROWAVES ON MANKIND},
year = {1958},
}