A Health Hazard Assessment for Blast Overpressure Exposures Subtitle - Use of Animal Test Data in the Development of a Human Auditory Hazard Criterion for Impulse Noise (Part 1)
JAYCOR SAN DIEGO CA
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Hearing loss and sensory cell loss data, obtained from 909 chinchillas exposed to one of 137 different impulse noise or blast wave exposure paradigms, were statistically analyzed. The objective was to extract relations between the effects of the exposure on the auditory system effects metrics and metrics used to characterize the blast wave exposure. Specifically the following two questions were asked a What is the best indicator of the amount of hazard associated with an impulse noise exposure b How does the hazard of an impulse noise exposure accumulate with increasing numbers of impulses Two analytical approaches were used. Both approaches indicated that the P-weighting functions or one of its derivatives P1-, P2- or R-weighting best organized the effects metrics. Depending on the analytical approach, either an energy trading rule of 10 log10 N or 6 log10 N where N is the number of impulses, best organized the data for N between 10 and 100. For exposures of between 1 and 10 impulses, a region of the parametric space that is of considerable practical significance, there is insufficient data to form any conclusions. For this region the limited data suggest that an energy trading rule i.e., 10 log N, does not work.
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