Measurement of Power Density from Marine Radar
D.W. Peak, D.L. Conover, W.A. Herman, R.E. Shuping · 1975
Marine radar creates powerful microwave exposures that affect millions near ports and waterways.
Plain English Summary
This 1975 government study measured power density levels from marine radar systems, documenting the electromagnetic radiation exposure these navigation devices produce. The research provided technical data on radar emissions that ships' crews and coastal communities encounter regularly. Such measurements help establish baseline exposure levels for occupational and public health assessments.
Why This Matters
Marine radar represents one of the most powerful EMF sources in everyday use, yet it rarely enters public health discussions. These massive rotating antennas beam intense microwave radiation across harbors, marinas, and coastal areas where millions live and work. The science demonstrates that radar operates at similar frequencies to microwave ovens but with far greater power output. What this means for you: if you live near ports, work on vessels, or frequent marinas, you're exposed to EMF levels that dwarf your cell phone. This 1975 government research laid groundwork for understanding these exposures, yet decades later, we still lack comprehensive health studies on the cumulative effects of marine radar on coastal populations and maritime workers.
Exposure Information
Specific exposure levels were not quantified in this study.
Study Details
To estimate the range and magnitude of microwave exposure from marine radar and to determine if theoretically calculated power densities, using manufacturer's nominal parameters, are comparable to experimentally measured power densities.
Measurements were made on small craft radar in the Miami-Ft. Lauderdale, Florida, and Mobile, Alabam...
Tables 2, 3, 4 and 5 present the results of empirical measurements and compare them with theoretical...
In general, the approximate power densities in the far fields of marine radar units may be computed using conventional antenna relationships and nominal manufacturers' specifications for the radar parameters. It is also clear, however, that significant variations from the computed values may occur. It seems unlikely that personnel would normally be exposed to average power densities approaching 1 mW/cm2 due to the radiation from a small-craft radar having a rotating antenna. Two caveats seem appropriate: Should a small-craft radar be operated with the antenna rotation stopped, significantly increased levels of exposure might be encountered. Exposure under such conditions probably should be avoided. Furthermore, peak power density in the regions surrounding the antenna may be quite high. Any possible biological hazards associated with these peak power densities are uncertain at present.
Show BibTeX
@article{measurement_of_power_density_from_marine_radar_g5824,
author = {D.W. Peak and D.L. Conover and W.A. Herman and R.E. Shuping},
title = {Measurement of Power Density from Marine Radar},
year = {1975},
}