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Exposure to high-frequency transient electromagnetic fields

J H Skotte1

  • 1National Institute of Occupational Health, Copenhagen, Denmark.

Scandinavian Journal of Work, Environment & Health
|February 1, 1996
PubMed
Summary

Exposure to high-frequency transient (HFT) electromagnetic fields was infrequent in occupational and residential settings. Instrumentation for measuring these HFT fields requires further development for accurate assessment.

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Area of Science:

  • Electromagnetics
  • Occupational Health
  • Environmental Science

Background:

  • High-frequency transient (HFT) electromagnetic fields are present in various environments.
  • Assessing exposure levels is crucial for understanding potential health impacts.
  • Existing measurement tools may have limitations in accuracy and scope.

Purpose of the Study:

  • To evaluate exposure to HFT electromagnetic fields in both workplace and home settings.
  • To identify which occupational groups experience higher exposure levels.
  • To investigate the reliability of current HFT field measurement instruments.

Main Methods:

  • Personal dosimeters were used to measure HFT electromagnetic field exposure in 301 volunteers over 24-hour periods.
  • Participants included electrical utility workers, office/industrial workers, and residents near high-power lines.
  • Exposure was quantified as the time proportion exceeding a 200 V.m-1 threshold at 5-20 MHz, with instrument calibration checks performed.

Main Results:

  • Workday exposure above 0.1 ppm was observed in 6.5-9.4% of measurements for utility groups, versus 0.9% for non-work measurements.
  • Radio-telephones likely contributed to HFT events, particularly for generation workers.
  • Dosimeter threshold levels varied significantly with field polarization, indicating potential measurement inaccuracies.

Conclusions:

  • HFT electromagnetic fields were generally found to occur infrequently.
  • Exposure rankings for HFT fields differed from those for 50 Hz magnetic fields.
  • There is a clear need for improved instrumentation for accurate HFT field measurements.

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