THE ABSORPTION OF ELECTROMAGNETIC ENERGY IN BODY TISSUES
Herman P. Schwan, Geo Morris Piersol · 1955
This 1955 research established foundational principles for understanding how electromagnetic energy heats body tissues.
Plain English Summary
This pioneering 1955 study by Herman Schwan examined how electromagnetic energy from microwave sources gets absorbed by human body tissues, focusing on the heating effects and temperature changes. The research explored how microwaves interact with different tissues and how blood flow affects heat distribution, laying crucial groundwork for understanding electromagnetic absorption in biological systems.
Why This Matters
This landmark research represents one of the earliest systematic investigations into how electromagnetic energy interacts with human tissue. Schwan's work established fundamental principles that remain relevant today as we grapple with exponentially higher EMF exposures from wireless devices. The study's focus on tissue heating and electromagnetic absorption patterns helped establish the foundation for modern specific absorption rate (SAR) measurements used in cell phone safety testing. What makes this research particularly significant is its timing - conducted in 1955, it anticipated many of the biological interaction mechanisms we're still studying today. The reality is that while this early research focused primarily on thermal effects from high-power microwave sources, we now know that biological effects can occur at much lower power levels through non-thermal mechanisms that weren't well understood at the time.
Exposure Information
Specific exposure levels were not quantified in this study. Duration: 20 minutes average duration of treatment
Study Details
To review and critically analyze the absorption of electromagnetic energy in body tissues, particularly focusing on physiological and clinical aspects of microwave diathermy.
The study is a review and critical analysis of existing literature on electromagnetic energy absorpt...
The review found that effective tissue heating can be brought about by microwave diathermy. Temperat...
Microwave radiation can be applied more conveniently than other forms of diathermy. The degree of heating and depth of penetration depend upon the type of director used, power output, distance from skin surface, and treatment duration. The physiological effects include increased temperature, accelerated blood flow, vasodilatation, and increased metabolic activities. However, accurate determination of dosage and energy absorbed by tissues cannot be determined accurately, relying instead on subjective patient sensation.
Show BibTeX
@article{the_absorption_of_electromagnetic_energy_in_body_tissues_g69,
author = {Herman P. Schwan and Geo Morris Piersol},
title = {THE ABSORPTION OF ELECTROMAGNETIC ENERGY IN BODY TISSUES},
year = {1955},
}