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HAZARDS DUE TO TOTAL BODY IRRADIATION BY RADAR

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H. P. SCHWAN, K. LI · 1956

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1956 radar research established that 0.02 watts per square centimeter causes dangerous body heating, laying groundwork for modern EMF safety standards.

Plain English Summary

Summary written for general audiences

This 1956 study analyzed how radar radiation penetrates the human body and generates heat, establishing critical safety thresholds. Researchers found that radar energy above 0.02 watts per square centimeter could cause dangerous whole-body temperature increases, while levels above 0.2 watts per square centimeter permanently damage eyes. The research mapped how electromagnetic energy absorbs into skin, fat, and deeper tissues.

Why This Matters

This groundbreaking research established some of the earliest scientific understanding of how microwave radiation affects human tissue - knowledge that remains fundamentally relevant today. The study's finding that 0.02 watts per square centimeter causes intolerable heating helped establish safety standards still referenced in modern EMF guidelines. What's particularly striking is how this 1956 radar research anticipated many concerns we face with today's wireless devices. While modern cell phones operate at much lower power levels than the radar systems studied here, the basic physics of how electromagnetic energy penetrates and heats biological tissue remains unchanged. The research methodology of analyzing energy absorption coefficients and heat distribution patterns became the foundation for how we still assess EMF exposure today.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
H. P. SCHWAN, K. LI (1956). HAZARDS DUE TO TOTAL BODY IRRADIATION BY RADAR.
Show BibTeX
@article{hazards_due_to_total_body_irradiation_by_radar_g4031,
  author = {H. P. SCHWAN and K. LI},
  title = {HAZARDS DUE TO TOTAL BODY IRRADIATION BY RADAR},
  year = {1956},
  
  
}

Quick Questions About This Study

The study found that radar energy flux above 0.02 watts per square centimeter causes intolerable temperature rise throughout the body, while levels above 0.2 watts per square centimeter permanently damage eyes through irreversible heating effects.
The research analyzed how 10 cm wavelength electromagnetic radiation propagates into skin, subcutaneous fat, and deeper tissues, measuring both the percentage of airborne energy absorbed and the resulting heat distribution patterns throughout the body.
This study established fundamental understanding of how microwave radiation heats biological tissue and set critical power density thresholds that became the foundation for modern electromagnetic field exposure guidelines and safety standards still used today.
The study measured absorption coefficients showing how electromagnetic energy distributes as heat sources across different tissue types including skin, subcutaneous fat, and deeper situated tissues, with varying absorption rates depending on tissue composition and depth.
Yes, the research demonstrated that 10 cm wavelength electromagnetic radiation causes irreversible eye damage at energy flux levels as low as 0.2 watts per square centimeter, significantly lower than whole-body heating thresholds.