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HIGH POWER RADIOFREQUENCY AND MICROWAVE RADIATION SOURCES: A STUDY OF RELATIVE ENVIRONMENTAL SIGNIFICANCE

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Norbert N. Hankin, Richard A. Tell, T. Whit Athey, David E. Janes, Jr. · 1976

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Broadcast transmitters were identified as the most environmentally significant RF source in 1976, a finding that remains relevant today.

Plain English Summary

Summary written for general audiences

This 1976 EPA study analyzed major high-power radiofrequency sources including satellite terminals, radars, and broadcast transmitters to determine which posed the greatest environmental exposure risk. The research found that broadcast transmitters (radio and TV stations) represent the most environmentally significant source category due to their number, power levels, and proximity to populated areas.

Why This Matters

This early EPA analysis provides crucial historical context for our current EMF exposure landscape. In 1976, researchers already recognized that broadcast transmitters posed the greatest population-wide exposure risk among high-power RF sources. What's remarkable is how this finding remains relevant today, as AM/FM radio towers and TV transmitters continue operating at power levels that dwarf most other sources. The study's methodology of considering not just power output but also population exposure patterns established a framework we still use today. While our exposure profile has dramatically expanded with wireless devices, this research reminds us that some of our highest environmental exposures come from sources we rarely consider in daily EMF discussions.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Norbert N. Hankin, Richard A. Tell, T. Whit Athey, David E. Janes, Jr. (1976). HIGH POWER RADIOFREQUENCY AND MICROWAVE RADIATION SOURCES: A STUDY OF RELATIVE ENVIRONMENTAL SIGNIFICANCE.
Show BibTeX
@article{high_power_radiofrequency_and_microwave_radiation_sources_a_study_of_relative_en_g3593,
  author = {Norbert N. Hankin and Richard A. Tell and T. Whit Athey and David E. Janes and Jr.},
  title = {HIGH POWER RADIOFREQUENCY AND MICROWAVE RADIATION SOURCES: A STUDY OF RELATIVE ENVIRONMENTAL SIGNIFICANCE},
  year = {1976},
  
  
}

Quick Questions About This Study

The EPA study analyzed three major categories: satellite communication earth terminals, military and civilian radars, and broadcast transmitters including radio and TV stations. Researchers evaluated each category's power levels, population exposure potential, and environmental significance.
Broadcast transmitters were deemed most significant due to their combination of high power output, large numbers across populated areas, and continuous operation near residential zones. The study considered both source quantity and potential population exposure levels.
Unlike health-focused studies, this EPA research specifically examined environmental radiation monitoring levels and population-wide exposure patterns from major RF sources. It established a framework for assessing relative environmental significance of different high-power transmitter categories.
The study combined radiation characteristic measurements with environmental monitoring data and population exposure assessments. Researchers analyzed operating procedures, system characteristics, and the relative numbers of people potentially exposed to each source category.
Yes, AM/FM radio and TV broadcast towers continue operating at similar power levels today, often exceeding newer wireless sources. While our overall exposure landscape has changed dramatically, these high-power transmitters remain significant environmental RF sources.