Abstract
A comprehensive in‐ear noise dosimetry program has been performed on Radio Operations personnel. The noise exposure of 26 subjects was measured during normal work shifts over a period of about two weeks; mean subject noise exposures were calculated and compared to existing criteria. A total of 208 individual measurements were performed at Gander Aeradio, and at the Halifax and Vancouver Coast Guard Marine Radio stations. A miniature microphone was located in the cavum of the concha, allowing assessment of the combined contribution of both room and headset generated noise. An equalization network between the microphone and dosimeter approximated the frequency‐dependent pressure transformation required to equate in‐ear measured levels to free field conditions. Individual subject Leg's ranging from 73 to 100 dBA were noted. Pre/post shift audiometry was performed and is briefly summarized. The effect on measured levels of traffic, atmospheric, and operating conditions is discussed to form a background upon which mitigating measures can be based. Specific recommendations for acoustical treatment and proposals for modifications to radio equipment are discussed.
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