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A case for using A-weighted equivalent energy as a damage risk criterion for impulse noise exposure.

Authors
Murphy-WJ; McKinley-RL
Source
J Acoust Soc Am 2012 Apr; 131(4)(Pt 2):3532
NIOSHTIC No.
20040728
Abstract
Damage risk criteria (DRCs) for continuous noise rely upon epidemiologic analyses of populations of persons exposed over several years to noise in occupational environments. In 2006, the U.S. Army proposed to update the MIL-STD 1474D to use the Auditory Hazard Assessment Algorithm for Humans (AHAAH) and discontinue using the peak sound pressure level, envelope duration and number of impulses. The National Institute for Occupational Safety and Health has conducted two separate evaluations of the data used to justify the AHAAH methodology and found that the use of the A-weighted equivalent energy L(Aeq8) was more suitable for the purposes of predicting the effects of temporary threshold shifts (TTS) both in humans and in chinchillas. The L(Aeq8) method provided best fit for the TTS outcomes and demonstrated the greatest discrimination (ability to predict TTS) when compared to AHAAH, MIL-STD 1474D and two other proposed DRCs. Similarly, L(Aeq8) was found to give the best-fit and greatest discrimination for the chinchilla impulse noise exposures. The L(Aeq8) affords the best sensitivity and specificity for discrimination of potential hazards and has the greatest level of integration with present occupational exposure standards and prospective hearing protection labeling regulations.
Keywords
Noise; Exposure-assessment; Epidemiology; Noise-analysis; Noise-exposure; Noise-levels; Hearing-loss; Threshold-limit-values; Auditory-discrimination; Audiological-testing; Humans; Animals; Risk-factors; Standards; Hearing-protection; Hearing-threshold
Contact
William J. Murphy, National Institute for Occupational Safety and Health, Hearing Loss Prevention Team, 4676 Columbia Parkway, Mailstop C-27, Cincinnati, OH 45226-1998
CODEN
JASMAN
Publication Date
20120401
Document Type
Abstract
Email Address
wjm4@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B05102012
Issue of Publication
4
ISSN
0001-4966
NIOSH Division
DART
Priority Area
Construction; Manufacturing
Source Name
Journal of the Acoustical Society of America
State
OH
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