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The biological effects of magnetic fields on man

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E.E. KETCHEN, W.E. PORTER, N.E. BOLTON · 1978

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Human bodies can detect static magnetic field interactions starting at 80-100 gauss, with 200 gauss recommended as safe limit for extended exposure.

Plain English Summary

Summary written for general audiences

This 1978 review examined how stationary magnetic fields affect humans and animals. Researchers found that humans can detect magnetic field interactions starting at 80-100 gauss, and recommended limiting whole-body exposure to 200 gauss for extended periods. The study established early safety guidelines for static magnetic field exposure.

Why This Matters

This foundational research from 1978 represents some of the earliest systematic thinking about magnetic field exposure limits for humans. The 200 gauss recommendation for extended exposure may seem conservative by today's standards, but it reflects genuine scientific caution about biological effects we were just beginning to understand. What's particularly relevant today is how this compares to modern EMF sources. While this study focused on static magnetic fields, many household appliances and power lines create much lower field strengths, typically measured in milligauss rather than the hundreds of gauss discussed here. However, the key difference is that modern sources often involve rapidly changing electromagnetic fields rather than static ones, which can have entirely different biological effects. The research demonstrates that even decades ago, scientists recognized the need for exposure limits based on detectable biological interactions.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
E.E. KETCHEN, W.E. PORTER, N.E. BOLTON (1978). The biological effects of magnetic fields on man.
Show BibTeX
@article{the_biological_effects_of_magnetic_fields_on_man_g7018,
  author = {E.E. KETCHEN and W.E. PORTER and N.E. BOLTON},
  title = {The biological effects of magnetic fields on man},
  year = {1978},
  
  
}

Quick Questions About This Study

According to this research, the lowest detectable limit of interaction between humans and static magnetic fields is 80 to 100 gauss. This represents the threshold where biological effects become measurable.
Researchers recommended limiting whole-body or head exposure to static magnetic fields to 200 gauss on an extended period basis. This safety limit was based on biological interaction thresholds.
Static magnetic fields remain constant in strength and direction, unlike modern EMF sources like cell phones and WiFi that create rapidly changing electromagnetic fields with different biological interaction patterns.
Yes, the research indicated that higher magnetic field exposure limits are acceptable for limited time periods, though the specific values weren't detailed in the available abstract.
Scientists recognized that magnetic fields could produce detectable biological interactions in humans and animals, necessitating safety guidelines to prevent potential adverse effects from occupational or medical exposures.