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Effective quiet and moderate TTS: implications for noise exposure standards.

Authors
Ward-WD; Cushing-EM; Burns-EM
Source
J Acoust Soc Am 1976 Jan; 59(1):160-165
NIOSHTIC No.
00052614
Abstract
Effective quiet, the highest sound pressure level of a noise that will neither produce a significant temporary threshold shift; or TTS, nor retard recovery from a TTS produced by a prior exposure to a higher level, is shown to be about 76 decibels for octave bands of noise centered at 250 and 500 hertz and around 68 decibels for those centered at 1000, 2000, or 4000 hertz. On the other hand, a mean TTS 2 minutes after exposure of no greater than 10 decibels at all frequencies from 500 to 5600 hertz is produced by a broad-band noise whose octave-band spectrum falls off at - 5 decibels per octave ("magenta" noise) and which has an A-weighted level of 90 decibels. When the group mean TTS is 10 decibels, less than 10 percent of normal ears will show a TTS of 20 decibels. Therefore if a 20 decibels TTS is tolerable day after day with no adverse effects, the present industrial noise exposure limit of 8 hours at 90 decibels A would adequately protect more than 90 percent of exposed workers in noise with similarly falling spectra. Correction factors for unusual spectra should, however, be developed.
Keywords
NIOSH-Publication; NIOSH-Grant; Noise-induced-hearing-loss; Noise-levels; Noise-control; Acoustical-measurements; Hearing-threshold; Safety-measures; Ear-protection; Occupational-health; Control-measures; Safety-standards
Contact
Otolaryngology U of Minnesota Box 461 Mayo Minneapolis, Minn 55455
CODEN
JASMAN
Publication Date
19760101
Document Type
Journal Article
Funding Amount
290004
Funding Type
Grant
Fiscal Year
1976
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00350
Issue of Publication
1
ISSN
0001-4966
Priority Area
Noise-induced-hearing-loss
Source Name
Journal of the Acoustical Society of America
State
MN
Performing Organization
University of Minnesota Minneapolis, Minneapolis, Minnesota
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