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Long-Term 2450-MHz CW Microwave Irradiation of Rabbits: Methodology and Evaluation of Ocular and Physiologic Effects

No Effects Found

A.W. Guy, P.O. Kramar, C.A. Harris, C.K. Chou · 1980

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Six months of daily 2450 MHz microwave exposure showed no obvious health effects in rabbits, but biochemical changes were detected.

Plain English Summary

Summary written for general audiences

Researchers exposed four rabbits to 2450 MHz microwave radiation (the same frequency used in microwave ovens and early WiFi) at 10 mW/cm² for 23 hours daily over 180 days. Standard health measurements showed no significant effects on eyes, body weight, blood counts, or temperature compared to unexposed rabbits.

Why This Matters

This 1980 study represents early systematic research into chronic microwave exposure effects, using power levels roughly 50 times higher than current WiFi routers emit. The 2450 MHz frequency tested remains ubiquitous today in microwave ovens, older WiFi systems, and some Bluetooth devices. While the researchers found no obvious physiological changes in standard health markers, they notably mention that 'biochemical effects' were discovered and reported separately. This pattern of finding cellular-level changes without immediate clinical symptoms has become a recurring theme in EMF research. The study's 180-day duration was substantial for its time, though modern chronic exposure concerns involve decades of daily use. What this research demonstrates is that even relatively high-power microwave exposure doesn't produce dramatic, immediately observable health effects in the short term, yet subtle biological changes may still occur at the cellular level.

Figures from the Original Paper

Diagrams extracted from the original research document.

chartPage 3 - AI-described figure: A chart showing averaged SAR patterns based on two rabbits exposed to 2450-MHz microwaves with respect to horizontal vs. vertical conditions.
p. 3 of the original PDF
diagramPage 4 - Figure 4: View from the overhead of chronic-exposure laboratory showing four experimental chambers and four control chambers.
p. 4 of the original PDF
chartPage 5 - AI-described figure: Figure 6: Power-density values along axis of horn from center of rabbit.
p. 5 of the original PDF
chartPage 6 - Figure 8 illustrates H-plane power density in a chronic exposure chamber for different positions along the body axis of an animal.
p. 6 of the original PDF
Cite This Study
A.W. Guy, P.O. Kramar, C.A. Harris, C.K. Chou (1980). Long-Term 2450-MHz CW Microwave Irradiation of Rabbits: Methodology and Evaluation of Ocular and Physiologic Effects.
Show BibTeX
@article{long_term_2450_mhz_cw_microwave_irradiation_of_rabbits_methodology_and_evaluatio_g6373,
  author = {A.W. Guy and P.O. Kramar and C.A. Harris and C.K. Chou},
  title = {Long-Term 2450-MHz CW Microwave Irradiation of Rabbits: Methodology and Evaluation of Ocular and Physiologic Effects},
  year = {1980},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

The rabbits were exposed to 10 mW/cm² of 2450 MHz microwave radiation daily. This is roughly 50 times stronger than typical WiFi router emissions and comparable to standing very close to a microwave oven.
Each rabbit received 23 hours of 2450 MHz microwave exposure per day for 180 days (six months). The four exposed rabbits were compared with four sham-exposed rabbits.
No eye damage was observed in the rabbits after six months of daily 2450 MHz exposure. The researchers specifically examined ocular effects since microwaves can heat tissue and the eyes are particularly vulnerable.
Body mass, urinary output, rectal temperature, hematocrit, hemoglobin, white blood cell count, and blood coagulation studies all remained normal. These represent the basic physiological measurements available in 1980.
While standard health measurements showed no effects, the researchers noted that biochemical changes were detected and reported in a companion study. This suggests cellular-level effects occurred despite normal clinical markers.