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ELECTRIC AND MAGNETIC FIELD INTENSITIES AND ASSOCIATED INDUCED BODY CURRENTS IN MAN IN CLOSE PROXIMITY TO A 50 KW AM STANDARD BROADCAST STATION

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Human bodies conduct measurable electrical currents when exposed to intense AM radio frequency fields near broadcast towers.

Plain English Summary

Summary written for general audiences

Researchers measured electric and magnetic fields near a 50,000-watt AM radio station and found extremely high exposure levels up to 300 volts per meter just 2 meters from the antenna. They also measured electrical currents flowing through human bodies in these fields, finding levels 260-290 times higher per unit of electric field than typical exposures.

Why This Matters

This study reveals the extraordinary EMF exposures that can occur near high-power radio transmitters. The electric field levels of 300 V/m measured just 2 meters from this 50 kW AM station are roughly 1,000 times higher than typical residential exposures from power lines or household appliances. What makes this research particularly valuable is the direct measurement of currents flowing through human bodies in these intense fields. The science demonstrates that theoretical calculations accurately predict real-world body currents, validating our understanding of how EMF interacts with human physiology. While few people work directly beside broadcast antennas, this data helps establish the biological mechanisms through which EMF affects the human body. The reality is that if measurable currents flow through people at these frequencies, similar but smaller effects likely occur from our everyday wireless devices operating at higher frequencies.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (n.d.). ELECTRIC AND MAGNETIC FIELD INTENSITIES AND ASSOCIATED INDUCED BODY CURRENTS IN MAN IN CLOSE PROXIMITY TO A 50 KW AM STANDARD BROADCAST STATION.
Show BibTeX
@article{electric_and_magnetic_field_intensities_and_associated_induced_body_currents_in__g5464,
  author = {Unknown},
  title = {ELECTRIC AND MAGNETIC FIELD INTENSITIES AND ASSOCIATED INDUCED BODY CURRENTS IN MAN IN CLOSE PROXIMITY TO A 50 KW AM STANDARD BROADCAST STATION},
  year = {n.d.},
  
  
}

Quick Questions About This Study

Electric field strengths reached 300 volts per meter at just 2 meters from the monopole antenna. This is extraordinarily high compared to typical residential EMF exposures, which are usually measured in millivolts per meter.
The 720 kHz AM frequency induced body currents of 260-290 microamps per volt per meter, depending on the person's height. These currents were measured by having people stand on isolated ground planes.
Wave impedance measurements showed field characteristics differed from normal up to 150 meters from the antenna. The most intense exposures occurred within the first few meters of the monopole radiator.
Yes, theoretical calculations using a prolate spheroidal model of the human body showed excellent agreement with measured data. This validates that computer models can accurately predict EMF-induced currents in humans.
Direct measurement of specific absorption rates (SAR) in full-sized humans is difficult at medium wave frequencies like AM radio. Measuring induced body currents provides an alternative validation method for theoretical calculations.