Nonionizing Electromagnetic Wave Effects in Biological Materials and Systems
Curtis C. Johnson, Arthur W. Guy · 1972
Even in 1972, scientists recognized that electromagnetic radiation causes biological effects at levels well below those causing obvious harm.
Plain English Summary
This 1972 review examined electromagnetic wave effects across the entire spectrum from radio frequencies to light on biological systems. The study found that while high-intensity radiation clearly causes harm like burns and cataracts, lower-level exposures produce biological effects whose health significance remains unknown. The research also noted that some electromagnetic effects can be beneficial for medical treatments.
Why This Matters
This early review represents a pivotal moment in EMF research history, documenting the first systematic recognition that biological effects occur at radiation levels well below those causing obvious thermal damage. What makes this 1972 study particularly significant is its acknowledgment of a critical gap that persists today: we can measure biological responses to low-level EMF, but determining whether these effects constitute actual harm remains challenging. The study's observation that 'behavioral changes have been reported' at non-thermal levels foreshadowed decades of research into EMF's neurological impacts. Today's wireless devices operate at power levels that would fall squarely into this study's 'low-level effects' category, making the fundamental question raised here more relevant than ever.
Figures from the Original Paper
Diagrams extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{nonionizing_electromagnetic_wave_effects_in_biological_materials_and_systems_g5530,
author = {Curtis C. Johnson and Arthur W. Guy},
title = {Nonionizing Electromagnetic Wave Effects in Biological Materials and Systems},
year = {1972},
}