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Comparison of impulse noise damage risk criteria using the chinchilla impulse noise exposures.
MedLine Citation:
PMID:  20330447     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The 1968 CHABA recommendations to limit impulsive noise exposure to levels below 140 dB sound pressure level form the basis of current United States occupational and military standards. The U.S. military standard, MIL-STD 1474D, estimates the number of allowable shots to which a person may be exposed using peak level, B-duration, for varying levels of hearing protection usage. The French Weapons Noise Committee has uses the 85 dBA A-weighted equivalent level, L(Aeq8 hr), as the limit for allowable exposures. The U.S. Army sponsored a series of noise exposures with chinchillas to investigate the effects of level, number of impulses, and interstimulus interval. Several types of impulses were created ranging from acoustic shock tubes to narrow band impacts reproduced by a loudspeaker. The goodness-of-fit and the discrimination of five noise exposure metrics were evaluated in this study: MIL-STD 1474D, AHAAH model, L(Aeq8 hr), Pfander's C-duration metric, and Smoorenburg's D-duration metric. Goodness-of-fit was evaluated with a logistic regression and discrimination was evaluated using the area under the receiver operator characteristic curve. The L(Aeq8 hr) was found to best predict the temporary threshold shifts and the AHAAH model was found to best predict the permanent threshold shifts. [Partial funding provided by US Army Aeromedical Research Laboratories MIPR8J07586218].
Authors:
William J Murphy; Amir Khan; Peter B Shaw
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  127     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-03-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1839     Citation Subset:  IM    
Affiliation:
Hearing Loss Prevention Team, CDC/NIOSH, 4676 Columbia Parkway, MS C-27, Cincinnati, OH 45226, wjm4@cdc.govCDC/NIOSH, Cincinnati, OH 45226.
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