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The relationship of the exchange rate to noise-induced hearing loss.

Authors
Suter-AH
Source
NIOSH 1992 Sep; :1-58
Link
NIOSHTIC No.
00210240
Abstract
The use of the exchange rate concept for predicting noise induced hearing loss based on noise level and duration was reviewed and discussed. The selection of an appropriate exchange rate necessitates examining the growth of equal hearing hazard as a function of noise level and duration. This relationship depends on numerous variables, including the measure of damage, the audiometric frequencies to be protected, and various temporal and acoustic parameters such as the noise on time and off time and the level of quiet during interruptions. Several assumptions and methods for predicting permanent hearing damage were discussed. Evidence from several animal studies and certain field studies suggested the 3 decibel (dB) exchange rate, but to allow an adjustment to the maximum permissible exposure limit for outdoor, intermittent noise exposures. This was in contrast to a 5dB exchange rate, for which there appeared to be little scientific support. The amount of such an adjustment should ideally be determined by the temporal pattern of the noise and the levels of quiet between noise bursts. The author suggests that until further information becomes available, the adoption of a conservative approach would be to allow a small increase, such as 2dB to the permissible exposure limit for outdoor occupations.
Keywords
NIOSH-Contract; Noise-induced-hearing-loss; Hearing-loss; Noise-exposure; Ear-disorders; Hearing-threshold; Steady-state-noise
Publication Date
19920908
Document Type
Final Contract Report
Fiscal Year
1992
NTIS Accession No.
PB93-118610
NTIS Price
A05
Identifying No.
Task-Order-9139562
NIOSH Division
DSDTT
Priority Area
Noise-induced-hearing-loss
Source Name
Division of Standards Development and Technology Transfer, NIOSH, U.S. Department of Health and Human Services, NIOSH Purchase Order Report 9139562, 58 pages, 100 references
State
OH
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