A comparison of the dielectric behaviour of pure water and human blood at microwave frequencies
H. F. Cook · 1952
Human blood responds to microwave radiation exactly like water, revealing why wireless frequencies interact so readily with our bodies.
Plain English Summary
This 1952 study measured how microwave frequencies (1.7 to 24 billion cycles per second) interact with water and human blood. Researchers found that blood's electrical properties are primarily determined by its water content, and that microwaves affect blood the same way they affect pure water.
Why This Matters
This foundational research from 1952 reveals something crucial about microwave radiation and human biology: our blood responds to microwaves exactly like water does. Since the human body is roughly 60% water, this finding helps explain why microwave frequencies used in modern wireless devices can interact so readily with our tissues. The study showed that blood's dielectric properties (how it responds to electromagnetic fields) are dominated by water molecules, making our circulatory system particularly responsive to microwave radiation. What makes this research especially significant is its timing - it was conducted decades before cell phones, WiFi, and other wireless technologies became ubiquitous. The frequencies tested (1.7 to 24 GHz) overlap with many of today's wireless communications, including parts of the spectrum used for 5G networks. This early science demonstrates that researchers understood the biological interaction potential of microwaves long before we began surrounding ourselves with devices that emit them continuously.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{a_comparison_of_the_dielectric_behaviour_of_pure_water_and_human_blood_at_microw_g6601,
author = {H. F. Cook},
title = {A comparison of the dielectric behaviour of pure water and human blood at microwave frequencies},
year = {1952},
}