Measurement of power density from marine radar, DHEW Publication (FDA) 76-8004
Peak DW, Conover DL, Herman WA, Shuping RE · 1975
This 1975 FDA study measured marine radar power density to assess occupational exposure risks for maritime workers.
Plain English Summary
This 1975 FDA government report measured power density levels from marine radar systems to assess occupational exposure risks for maritime workers. The study examined actual radar emissions to understand potential health impacts from prolonged exposure to these high-powered navigation systems. This research contributed to early efforts to establish safety guidelines for radar operators.
Why This Matters
This FDA report represents crucial early documentation of radar exposure levels in occupational settings, particularly relevant as marine radar systems operate at much higher power levels than typical consumer electronics. Maritime workers face prolonged, close-proximity exposure to radar emissions during their shifts, creating a unique occupational health scenario that deserves attention. The timing of this 1975 study is significant because it predates much of our current understanding of EMF health effects, yet it demonstrates early regulatory awareness of potential risks from high-powered radar systems.
What makes marine radar exposure particularly concerning is the combination of high power density and extended exposure duration. Unlike brief exposures from everyday devices, radar operators can face hours of exposure during their work shifts. The science demonstrates that occupational EMF exposures often exceed residential levels by orders of magnitude, making studies like this essential for protecting worker health.
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. On the basis of measurements and computations, it seems unlikely that personnel would normally be exposed to average power densities approaching 1 W/cm2 due to the radiation from a small-craft radar having a rotating antenna. The American National Standards Institute has recommended that occupational exposure not exceed a power density of 10 mW/cm2 for 1 hour or more, nor an energy density of 1.0 W-hr/cm during any 0.1-hour period under normal environmental conditions. It seems unlikely that these levels of average exposure would be encountered under the cited conditions.
Show BibTeX
@article{measurement_of_power_density_from_marine_radar_dhew_publication_fda_76_8004_g6341,
author = {Peak DW and Conover DL and Herman WA and Shuping RE},
title = {Measurement of power density from marine radar, DHEW Publication (FDA) 76-8004},
year = {1975},
}