MICROWAVE RADIATION OF 10 mw/cm² And Factors that Influence Biological Effects At Various Power Densities
William B. Deichmann, Frank H. Stephens Jr. · 1961
1961 research demonstrated that 10 mW/cm² microwave radiation produces biological effects influenced by power density and exposure timing.
Plain English Summary
This 1961 conference paper examined how microwave radiation at 10 milliwatts per square centimeter affects biological systems, investigating factors like power density levels and exposure timing that influence these effects. The research explored tolerance dosages and irradiation cycle rates to understand how different exposure parameters create varying biological responses. This represents early scientific recognition that microwave radiation produces measurable biological effects in living organisms.
Why This Matters
This 1961 research represents a pivotal moment in EMF science - early recognition that microwave radiation produces biological effects at specific power densities. The 10 milliwatts per square centimeter studied here is roughly 50 times higher than typical cell phone exposures today, yet the research established that factors like exposure timing and power density levels significantly influence biological responses. What makes this particularly relevant is that it emerged during the dawn of the microwave age, when scientists first began systematically investigating how these frequencies interact with living tissue. The focus on 'tolerance dosage' suggests researchers were already recognizing that biological systems have thresholds for microwave exposure - a concept that remains central to EMF safety standards today, though modern exposure levels are far lower than those studied in this early work.
Figures from the Original Paper
Diagrams extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study. Duration: 1-16 minutes for continuous exposure, intermittent exposure varied from 1 minute every 5-14 minutes
Study Details
To investigate factors that influence biological effects of microwave radiation at various power densities and to determine how these factors modify safe exposure levels
Experimental studies using rats exposed to microwave radiation at various power densities (250 mw/cm...
Results showed that exposure time significantly affected survival rates; continuous exposure resulte...
Multiple factors significantly influence biological effects of microwave radiation. A tolerance dose of 10 mw/cm2 recommended in 1958 was found to be too high. The safe exposure level should be much lower (0.01 w/cm2) and is influenced by frequency, exposure time, irradiation cycle rate, air currents, environmental temperature, body weight, positioning, tissue sensitivity, and reflection effects. These findings suggest that safe exposure levels must account for multiple variables rather than a single fixed dose.
Show BibTeX
@article{microwave_radiation_of_10_mw_cm_and_factors_that_influence_biological_effects_at_g4165,
author = {William B. Deichmann and Frank H. Stephens Jr.},
title = {MICROWAVE RADIATION OF 10 mw/cm² And Factors that Influence Biological Effects At Various Power Densities},
year = {1961},
}