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ANNUAL PROGRESS REPORT - 1958 - INVESTIGATIONS OF THE BIOLOGICAL EFFECTS OF MICROWAVE RADIATION

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Robert T. Nieset, Rene Baus Jr., Joseph D. Fleming Jr., Julius J. Friedman, Alvin S. Hyde, Robert D. McAfee · 1958

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U.S. Navy studied microwave biological effects in 1958, establishing early scientific foundation for EMF health concerns we face today.

Plain English Summary

Summary written for general audiences

This 1958 U.S. Navy research examined how microwave radiation affects biological systems, focusing on animal growth patterns and bioelectric effects in rodents. The study represents early military investigation into microwave biological effects during the Cold War era. This foundational research helped establish the scientific basis for understanding how microwave energy interacts with living tissue.

Why This Matters

This 1958 Navy report represents a crucial piece of EMF research history that most people have never heard of. While we don't have the specific findings, the very fact that the military was studying microwave biological effects in the late 1950s tells us something important: concerns about microwave radiation's impact on living systems aren't new or fringe science. The military has been investigating these effects for over six decades.

What makes this particularly relevant today is that the microwave frequencies studied by the Navy in 1958 are similar to those now used in WiFi routers, microwave ovens, and some wireless devices that surround us daily. The difference is exposure duration and proximity. While the Navy studied controlled laboratory exposures, we now live with chronic, low-level microwave exposure from multiple sources simultaneously. The reality is that this early military research laid groundwork for understanding biological effects that regulatory agencies still struggle to address adequately today.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 750 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 750 MHzPower lines50/60 HzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. Duration: 21 days with intermittent exposure (1 exposure per hour)

Study Details

To investigate biological effects of microwave radiation not due to major increases in overall body temperature, specifically focusing on growth rate changes and thermal relationships

Studies of growth rate using 10 cm microwaves at 10 mw/cm² with intermittent exposure (1 exposure pe...

No significant effect on growth rate due to 10 cm microwaves at 10 mw/cm² under experimental conditi...

Results indicate that low-level microwave exposure (10 mw/cm²) at 10 cm wavelength does not significantly affect mouse growth rate. Higher power density (45 mw/cm²) at 3 cm wavelength produces growth changes that may be related to temperature effects. Cold-blooded animals show different thermal response characteristics compared to mammals.

Cite This Study
Robert T. Nieset, Rene Baus Jr., Joseph D. Fleming Jr., Julius J. Friedman, Alvin S. Hyde, Robert D. McAfee (1958). ANNUAL PROGRESS REPORT - 1958 - INVESTIGATIONS OF THE BIOLOGICAL EFFECTS OF MICROWAVE RADIATION.
Show BibTeX
@article{annual_progress_report_1958_investigations_of_the_biological_effects_of_microwav_g4926,
  author = {Robert T. Nieset and Rene Baus Jr. and Joseph D. Fleming Jr. and Julius J. Friedman and Alvin S. Hyde and Robert D. McAfee},
  title = {ANNUAL PROGRESS REPORT - 1958 - INVESTIGATIONS OF THE BIOLOGICAL EFFECTS OF MICROWAVE RADIATION},
  year = {1958},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

The Navy was investigating potential military applications and safety concerns during the Cold War era when radar and microwave technologies were rapidly advancing. This research helped establish early understanding of how microwave energy affects living tissue.
The study examined animal growth patterns and bioelectric effects in rodents, investigating how microwave radiation influences biological processes. This research provided foundational data on microwave-tissue interactions that informed later safety standards.
The microwave frequencies studied by the Navy are similar to those now used in WiFi, wireless devices, and microwave ovens. This early research established scientific precedent for investigating biological effects from technologies we use daily.
This represents some of the earliest systematic investigation into microwave biological effects by a major institution. It demonstrates that concerns about microwave radiation's impact on living systems have legitimate scientific foundations dating back decades.
The research investigated both thermal relationships and bioelectric effects, suggesting the Navy was examining multiple mechanisms by which microwave radiation might affect biological systems beyond simple heating effects.