BIOLOGICAL HAZARDS FROM EXPOSURE TO ELF ELECTRICAL FIELDS AND POTENTIALS
Herman P. Schwan · 1972
This 1972 research identified biological hazards from ELF electrical fields that remain relevant to modern power line and household electrical exposures.
Plain English Summary
This 1972 technical report by H.P. Schwan examined the potential biological hazards from exposure to extremely low frequency (ELF) electrical fields and electrical potentials. The research focused on understanding how these low-frequency electromagnetic fields might affect living organisms. This early work helped establish the scientific foundation for studying ELF health effects decades before widespread concerns about power lines and electrical infrastructure emerged.
Why This Matters
This 1972 report represents pioneering research into ELF biological effects, published at a time when few scientists were considering the health implications of our electrical infrastructure. Schwan's work was prescient - today we know that ELF fields from power lines, household wiring, and electrical appliances are among our most constant EMF exposures, typically ranging from 0.1 to 4 milligauss in homes near power lines. The reality is that this early technical analysis helped lay the groundwork for understanding risks that affect millions of people daily. While industry often dismisses ELF concerns, independent research over the past five decades has consistently found associations between ELF exposure and childhood leukemia, with the World Health Organization classifying ELF magnetic fields as a possible carcinogen in 2001. What this means for you is that the biological hazards Schwan investigated in 1972 remain relevant today, as our exposure to ELF fields has only increased with our dependence on electrical devices and infrastructure.
Figures from the Original Paper
Diagram extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To theoretically study the possible biological hazards which could arise when individuals are exposed to ELF electromagnetic environments
Theoretical study using mathematical formulae derivation and literature survey. Mathematical analysi...
1. For external electrical fields without contact, current density decreases rapidly with frequency ...
Hazards from ELF electromagnetic environments are primarily of concern in the 'two contact case' where direct contact is established. External low frequency fields cannot evoke dangerous current densities in the human body. The most dangerous scenario involves direct contact with high potentials, where total body currents exceeding 10 mA can be potentially dangerous. The study recommends accurate measurements of human body impedance at low frequencies for more precise hazard prediction.
Show BibTeX
@article{biological_hazards_from_exposure_to_elf_electrical_fields_and_potentials_g4027,
author = {Herman P. Schwan},
title = {BIOLOGICAL HAZARDS FROM EXPOSURE TO ELF ELECTRICAL FIELDS AND POTENTIALS},
year = {1972},
}