6,486 Studies Reviewed. 85.2% of Original Studies Found Biological Effects. The Evidence is Clear.

R-f pollution: a rising concern

Bioeffects Seen

Authors not listed · 1969

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Rats exposed to RF radiation at 6, 14, and 21 MHz showed harmful effects to gastrointestinal, cardiovascular, respiratory, and genito-urinary systems peaking at 35 days, with no changes detected in the endocrine system.

Plain English Summary

Summary written for general audiences

Researchers placed laboratory rats in an irradiation tank circuit to test their tolerance to radiation at 6, 14, and 21 MHz. The tests showed harmful effects to the gastrointestinal, cardiovascular, respiratory, and genito-urinary systems, peaking at 35 days after irradiation. No changes were detected in the endocrine system of the test animals.

Why This Matters

Measurements near high-frequency relay stations showed that both magnetic and electric fields were high around 500 kW transmitters, while 50 kW transmitters produced acceptable field levels. Researchers noted there is no direct way to relate laboratory measurements in watts per unit volume or weight to field measurements in watts per unit effective capture area. They equated a rat with a human for biological effects to circumvent this correlation problem.

Exposure Details

Power Density
10 mw/cm?

Exposure Context

This study used 10 mw/cm? for radio frequency:

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 10 mw/cm?Extreme Concern - 1,000 µW/m²FCC Limit - 10M µW/m²Effects observed in the Extreme Concern range (Building Biology)This level is 10 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 6-21 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 6-21 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale
Cite This Study
Unknown (1969). R-f pollution: a rising concern.
Show BibTeX
@article{r_f_pollution_a_rising_concern_g4880,
  author = {Unknown},
  title = {R-f pollution: a rising concern},
  year = {1969},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

No changes were detected in the endocrine system of the test animals, which the researchers attributed to possibly insufficiently sensitive detection equipment.
Measurements near government HF relay stations showed both magnetic and electric fields were high around 500 kW transmitters, magnetic fields were high but electric fields tolerable for 250 kW transmitters, and both fields were acceptable for 50 kW transmitters.
There is no direct way to relate laboratory measurements in watts per unit volume or weight of the test animal to field measurements in watts per unit effective capture area.