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Radio Frequency Nonionizing Radiation in a Community Exposed to Radio and Television Broadcasting

By Burch, James B.

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Book Id: WPLBN0000231371
Format Type: PDF eBook
File Size: 0.3 MB
Reproduction Date: 2005

Title: Radio Frequency Nonionizing Radiation in a Community Exposed to Radio and Television Broadcasting  
Author: Burch, James B.
Volume:
Language: English
Subject: Government publications, United Nations., United Nations. Office for Disarmament Affairs
Collections: Government Library Collection, Disarmament Documents
Historic
Publication Date:
Publisher: United Nations- Office for Disarmament Affairs (Unoda)

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Burch, J. B. (n.d.). Radio Frequency Nonionizing Radiation in a Community Exposed to Radio and Television Broadcasting. Retrieved from http://www.ebooklibrary.org/


Description
Government Reference Publication

Excerpt
Excerpt: Exposure to radio frequency (RF) nonionizing radiation from telecommunications is pervasive in modern society. Elevated disease risks have been observed in some populations exposed to radio and television transmissions, although findings are inconsistent. This study quantified RF exposures among 280 residents living near the broadcasting transmitters for Denver, Colorado. RF power densities outside and inside each residence were obtained, and a global positioning system (GPS) identified geographic coordinates and elevations. A viewshed model within a geographic information system (GIS) characterized the average distance and percentage of transmitters visible from each residence. Data were collected at the beginning and end of a 2.5-day period, and some measurements were repeated 8?29 months later. RF levels logged at 1-min intervals for 2.5 days varied considerably among some homes and were quite similar among others. The greatest differences appeared among homes within 1 km of the transmitters. Overall, there were no differences in mean residential RF levels compared over 2.5 days. However, after a 1- to 2-year follow-up, only 25% of exterior and 38% of interior RF measurements were unchanged. Increasing proximity, elevation, and line-ofsight visibility were each associated with elevated RF exposures. At average distances from > 1?3 km, exterior RF measurements were 13?30 times greater among homes that had > 50% of the transmitters visible compared with homes with ? 50% visibility at those distances. This study demonstrated that both spatial and temporal factors contribute to residential RF exposure and that GPS/GIS technologies can improve RF exposure assessment and reduce exposure misclassification. Key words: broadcasting, electromagnetic fields, exposure assessment, GIS, nonionizing radiation, radio, television.

 

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