✦ LIBER ✦

High-frequency hearing risk of operators of industrial ultrasonic devices

✍ Scribed by J. Grzesik; E. Pluta

Book ID: 104760521
Publisher: Springer-Verlag
Year: 1983
Tongue: English
Weight: 475 KB
Volume: 53
Category: Article
ISSN: 0340-0131
DOI: 10.1007/bf00406179

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✦ Synopsis

Sound and ultrasound emitted by industrial ultrasonic (Uls) devices exceed the known proposed hygienic limits, especially for frequencies 10-20 k Hz The consequence of this may be a negative influence of this energy on the auditory function in the high-frequency hearing range To determine the hearing risk to Uls operators, an adequate method for testing the hearing threshold from 10-20 k Hz has been developed In order to get reference values, 189 non-exposed persons were tested On this basis, the hearing thresholds of 55 operators for frequencies 500-20,000 Hz were evaluated In addition to threshold elevations in the range 10-20 k Hz, a decreasing number of subjects responding to stimuli at the highest audible frequencies was observed The threshold shift at 10-20 k Hz of subjects exposed to sound and ultrasound emitted by Uls-devices depends upon the physical parameters of the sound spectrum, time on the job and daily exposure time No abnormalities were found in the hearing range 500-8000 Hz.

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