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REPORT TO THE NATIONAL ASSOCIATION OF BROADCASTERS ON THE MEASUREMENT OF POWER DENSITY RELATIVE TO OSHA RADIATION HAZARD STANDARDS

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Smith and Powstenko · 1975

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Broadcasting industry sought worker protection from RF radiation in 1975, decades before consumer device safety became a concern.

Plain English Summary

Summary written for general audiences

This 1975 technical report examined how to measure power density from broadcasting equipment to ensure compliance with OSHA radiation hazard standards. The study provided measurement protocols for the National Association of Broadcasters to assess RF exposure levels at broadcast facilities. This work established early frameworks for protecting broadcast workers from radiofrequency radiation exposure.

Why This Matters

This report represents a pivotal moment when occupational RF exposure first became a regulatory concern. In 1975, OSHA was just beginning to grapple with radiation hazards in the workplace, and broadcast facilities presented unique challenges due to their high-power transmitters. The fact that the broadcasting industry commissioned this measurement guide shows they recognized potential worker safety issues decades before similar protections extended to the general public.

What's striking is the timing. While broadcast workers were getting exposure assessments and safety protocols in the mid-1970s, it would be decades before similar attention was paid to consumer devices like cell phones and WiFi routers that now expose millions daily. The power densities measured at broadcast facilities were likely orders of magnitude higher than today's consumer devices, yet we now carry those lower-level sources directly against our bodies for hours each day.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 10 MHz to 1019 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 10 MHz to 1019 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Study Details

To determine whether an accurate commercial power-density meter is available for use by broadcasters on broadcast frequencies and to evaluate the effectiveness of the NBS meter for measuring power density relative to OSHA standards.

Measurements were conducted at the Sears Tower and John Hancock Center in Chicago using the National...

No hazardous radiation levels (10 mw/cm²) were exceeded at any location. The 10 mw/cm² hazard level ...

Broadcasters have little reason for concern that hazardous levels of radiation are routinely caused by their operations. The NBS power-density meter is very simple to use and permits rapid observation of power density. While its cost is substantial, it is not excessive when related to its quality. The instrument is ideally suited to the subject purpose and allows for exactly repeatable measurements with ease.

Cite This Study
Smith and Powstenko (1975). REPORT TO THE NATIONAL ASSOCIATION OF BROADCASTERS ON THE MEASUREMENT OF POWER DENSITY RELATIVE TO OSHA RADIATION HAZARD STANDARDS.
Show BibTeX
@article{report_to_the_national_association_of_broadcasters_on_the_measurement_of_power_d_g3851,
  author = {Smith and Powstenko},
  title = {REPORT TO THE NATIONAL ASSOCIATION OF BROADCASTERS ON THE MEASUREMENT OF POWER DENSITY RELATIVE TO OSHA RADIATION HAZARD STANDARDS},
  year = {1975},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

OSHA established workplace radiation exposure limits to protect broadcast workers from high-power RF transmitters. This report helped broadcasters measure power density levels to ensure compliance with these early occupational safety standards for radiofrequency radiation exposure.
Broadcasting facilities operate high-power transmitters that create intense RF fields, potentially exposing workers to dangerous radiation levels. The industry needed standardized measurement methods to assess these exposures and implement appropriate safety measures for personnel working near transmission equipment.
Broadcast transmitters generate much higher power densities than consumer devices like phones or WiFi routers. However, workers had limited exposure time near transmitters, while today's devices provide continuous lower-level exposure directly against the body for hours daily.
The report outlined specific protocols for measuring RF power density at various distances from transmitting equipment. These methods helped broadcasters identify high-exposure areas and establish safety zones to protect workers from exceeding OSHA radiation limits.
This early work on occupational RF exposure measurement helped establish precedents for workplace radiation safety. The measurement protocols and safety concepts developed for broadcast workers likely influenced later development of RF exposure standards for both occupational and public settings.