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A Microwave Oven for Behavioural and Biological Research: Electrical and Structural Modifications, Calorimetric, Dosimetry, and Functional Evaluation

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D. R. Justesen, D. M. Levinson, R. L. Clarke, Nancy W. King · 1971

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Scientists were studying microwave biological effects at your oven's exact frequency back in 1971.

Plain English Summary

Summary written for general audiences

This 1971 study describes how researchers modified a commercial Tappan microwave oven to create a controlled research environment for studying biological effects of 2450 MHz microwave radiation on small animals. The researchers achieved stable power levels ranging from less than 1 watt to 400 watts and documented the thermal responses of exposed animals.

Why This Matters

This early research paper represents a foundational moment in EMF health research, establishing methodologies that would shape decades of microwave exposure studies. What's particularly significant is that researchers were already concerned enough about microwave biological effects in 1971 to engineer specialized equipment for controlled animal studies. The 2450 MHz frequency they used is identical to what your microwave oven operates at today, making this directly relevant to daily exposure questions. The fact that scientists were documenting thermal responses in animals at power levels ranging down to less than 1 watt suggests they recognized that even relatively low-power microwave exposure could produce measurable biological changes. This contradicts industry claims that only high-power, heating effects matter for health.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
D. R. Justesen, D. M. Levinson, R. L. Clarke, Nancy W. King (1971). A Microwave Oven for Behavioural and Biological Research: Electrical and Structural Modifications, Calorimetric, Dosimetry, and Functional Evaluation.
Show BibTeX
@article{a_microwave_oven_for_behavioural_and_biological_research_electrical_and_structur_g4771,
  author = {D. R. Justesen and D. M. Levinson and R. L. Clarke and Nancy W. King},
  title = {A Microwave Oven for Behavioural and Biological Research: Electrical and Structural Modifications, Calorimetric, Dosimetry, and Functional Evaluation},
  year = {1971},
  
  
}

Quick Questions About This Study

Researchers used 2450 MHz, which is the same frequency used in modern microwave ovens. This frequency was chosen because it effectively heats water molecules in biological tissue.
They made electrical and structural changes to achieve stable, electronically controlled microwave power levels ranging from 400 watts down to less than 1 watt for precise biological testing.
The modified oven could deliver microwave energy from 400 watts down to less than 1 watt, allowing researchers to study biological responses across a wide range of exposure intensities.
Yes, the study specifically documented thermal responses of irradiated animals, indicating that researchers were tracking temperature changes as a key biological endpoint of microwave exposure.
Tests with water phantom loads showed that available power distribution within the oven cavity was essentially uniform, ensuring consistent exposure levels for biological research subjects.