New data for noise standards.
Henderson D; Hamernic RP; Crossley J
Laryngoscope 1974 May; 84(5):714-721
Continuous noises and impulse noises, considered "safe" by existing damage risk criteria were combined to model more realistic noise environments. In monaural chinchillas, quiet thresholds were measured before and after exposure using the auditory evoked response, and histology was obtained, using the surface preparation technique. The audiometric and histological findings agree in showing that the superimposed combination of two "safe" noises produces traumatic effects that more than exceed the additive effects of either component. The existing damage risk criteria do not provide guidelines for such noise combinations.
NIOSH-Publication; NIOSH-Grant; Noise-induced-hearing-loss; Noise-control; Test-methods; Audiology; Sound-pressure-level; Hearing-threshold; Exposure-limits; Synergism; Ear-disorders; Hearing-disorders; Safety-measures; Noise-levels; Histopathology
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