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An Investigation of Broadcast Radiation Intensities at Mt. Wilson, California

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Richard A. Tell, Patrick J. O'Brien · 1977

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EPA's 1977 Mount Wilson investigation documented broadcast radiation levels at America's most concentrated transmission site during the early era of RF exposure research.

Plain English Summary

Summary written for general audiences

This 1977 EPA technical investigation measured broadcast radiation intensities at Mount Wilson, California, a major transmission site hosting numerous radio and television stations. The study documented RF exposure levels from multiple broadcast antennas operating simultaneously at this critical communications hub. This research provided baseline data for understanding cumulative broadcast radiation exposure in areas with concentrated transmission facilities.

Why This Matters

Mount Wilson represents one of America's most concentrated broadcast radiation environments, with dozens of high-power radio and television transmitters operating from its peak since the 1920s. This EPA investigation came at a crucial time when concerns about RF exposure were emerging, yet regulatory standards remained largely based on thermal effects rather than biological impacts. The reality is that broadcast facilities like Mount Wilson create cumulative exposure scenarios that most EMF research doesn't address - multiple frequencies operating simultaneously at high power levels over vast coverage areas.

What makes this study significant is its focus on real-world exposure conditions rather than laboratory settings. While we don't have the specific measurements, the mere fact that the EPA felt compelled to investigate broadcast intensities at such a prominent site suggests exposure levels warranted scientific attention. Today, Mount Wilson hosts even more transmitters, including cellular and microwave facilities, making historical baseline measurements like these invaluable for understanding how our RF environment has evolved.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Richard A. Tell, Patrick J. O'Brien (1977). An Investigation of Broadcast Radiation Intensities at Mt. Wilson, California.
Show BibTeX
@article{an_investigation_of_broadcast_radiation_intensities_at_mt_wilson_california_g3871,
  author = {Richard A. Tell and Patrick J. O'Brien},
  title = {An Investigation of Broadcast Radiation Intensities at Mt. Wilson, California},
  year = {1977},
  
  
}

Quick Questions About This Study

Mount Wilson hosts dozens of high-power radio and TV transmitters in one location, creating unusually concentrated RF exposure conditions. The EPA likely investigated due to growing concerns about cumulative radiation effects from multiple broadcast sources operating simultaneously.
Mount Wilson is one of America's most concentrated broadcast facilities, with numerous high-power radio and television stations transmitting from the same mountain peak since the 1920s, creating unique cumulative RF exposure scenarios.
Mount Wilson hosts dozens of broadcast facilities including major radio and television stations serving the Los Angeles area. The exact number has grown since 1977 to include cellular and microwave transmission facilities.
Yes, Mount Wilson now hosts even more transmitters than in 1977, including cellular towers and microwave facilities in addition to the original broadcast stations, potentially creating higher cumulative RF exposure levels.
The 1977 timeframe represents early recognition of potential RF health concerns, before current exposure standards were established. EPA's investigation suggests broadcast radiation levels at concentrated sites like Mount Wilson warranted scientific attention.