工場騒音の恕限度

概要

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In order to establish a preventive method for the occupational deafness, the author made hearing tests of 522 workers in various industrial noise and obtaind acoustical spectrum of the noise -by means of a frequency analyzer. It was confirmed that the noise over 80 db in the frequ-ency range higher than 2000 cps (re 0.0002 dyne/cm2) was harmful to the ear.The maximal safety level of industrial noise was decided in detail in wide range of frequencyfrom the relation between hearing loss and acoustical spectrum. Such a safety level was again confirmed by measuring auditory fatigue after exposuring normal hearing persons to industrial noise of various intensities for the period of 30 minutes.
社団法人日本耳鼻咽喉科学会の論文