Nonionizing Electromagnetic Wave Effects in Biological Materials and Systems
Curtis C. Johnson, Arthur W. Guy · 1972
Even in 1972, scientists documented biological effects from electromagnetic radiation at low intensities, though health implications remained unclear.
Plain English Summary
This 1972 review examined how electromagnetic waves from radio frequencies to visible light affect biological systems. The study found that high-intensity radiation can cause burns and cataracts, while lower-intensity effects were documented but their health significance remained unclear. The research also explored therapeutic applications and how electromagnetic waves penetrate and are absorbed by body tissues.
Why This Matters
This foundational 1972 review captures the early recognition that electromagnetic fields produce biological effects across a wide spectrum of frequencies. What's striking is how Johnson acknowledged biological responses at low radiation intensities even five decades ago, yet noted the uncertainty about whether these effects were harmful. This uncertainty persists today, despite thousands of subsequent studies. The research highlighted a critical issue that remains relevant: electromagnetic waves create 'hot spots' of energy absorption within the body, potentially concentrating effects in specific tissues. While the study emphasized therapeutic benefits, it also documented the reality that our bodies respond to electromagnetic energy at levels well below those that cause obvious thermal damage. This early work laid the groundwork for understanding that biological effects occur across the entire electromagnetic spectrum, from the radio frequencies used in today's wireless devices to the optical frequencies in LED lighting.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{nonionizing_electromagnetic_wave_effects_in_biological_materials_and_systems_g5532,
author = {Curtis C. Johnson and Arthur W. Guy},
title = {Nonionizing Electromagnetic Wave Effects in Biological Materials and Systems},
year = {1972},
}