Biological effects of high-frequency electromagnetic waves
Marha, K. · 1963
This 1963 research marked early scientific recognition that high-frequency electromagnetic waves produce biological effects requiring protective measures.
Plain English Summary
This 1963 technical report by K. Marha examined biological effects of high-frequency electromagnetic waves on both humans and animals. The research addressed occupational exposure concerns and engineering controls, representing early scientific investigation into radiofrequency health effects. This work contributed to foundational understanding of EMF biological impacts during the early development of wireless technologies.
Why This Matters
This 1963 report represents a pivotal moment in EMF health research, when scientists first began systematically documenting biological effects from high-frequency electromagnetic exposure. What makes this work particularly significant is its focus on occupational settings, where workers faced intense RF exposures that often exceeded anything consumers encounter today. The research examined both human health effects and animal toxicity, establishing early evidence that electromagnetic fields could produce measurable biological responses.
The timing of this research coincides with the expansion of radar, broadcasting, and industrial heating applications that exposed workers to powerful RF fields. While we don't have the specific findings, the fact that researchers were already investigating engineering controls suggests they observed concerning effects that warranted protective measures. Today's ubiquitous wireless devices operate at much lower power levels, but the cumulative exposure from smartphones, WiFi, and cellular networks means we're all now experiencing chronic low-level exposure that wasn't part of the human experience when this pioneering research was conducted.
Figures from the Original Paper
Diagram extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To discuss the influence of high-frequency electromagnetic waves on living matter, especially in the field of microwaves, dealing with penetration of high-frequency energy into the organism, electromagnetic induction of the body, and the existence of the non-thermal effect of electromagnetic waves
The first question deals with the penetration of high-frequency energy into the organism. The body, ...
The biological effects of high-frequency electromagnetic waves are complex and include both thermal and non-thermal effects. The thermal effects are primarily due to heating of tissues through dielectric losses and induction of high-frequency voltage through the blood and nervous system. Non-thermal effects are also significant and include changes in inter-neuron connections, inactivation of certain viruses, changes in the growth and infection properties of bacteria, and changes in the course of cell division, especially of chromosomes. The mechanism of these effects involves the oscillation of ions and dipoles, which can cause changes in cellular processes and structures. The effects are dependent on frequency, intensity, and duration of exposure, and can be cumulative with repeated exposure. Protection measures include prevention through proper shielding, avoiding metal objects, and using personal protective equipment. The maximum permissible field intensity varies depending on the criteria used, with thermal effects requiring different values than non-thermal effects. The biological effects are dependent not only on the intensity of the field but also on the intensity and time, and for shorter exposure, greater output density can be permitted. The biological efficiency of electromagnetic waves has no frequency dependence which can be generally expressed, and the biological effect is always forthcoming if a certain value of high-frequency energy is reached in the organism.
Show BibTeX
@article{biological_effects_of_high_frequency_electromagnetic_waves_g6643,
author = {Marha and K.},
title = {Biological effects of high-frequency electromagnetic waves},
year = {1963},
}