TTS_tからTTS_2への変換

概要

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Temporary threshold shift (TTS) is characterized by the fact that its magnitude generally decreases with the lapse of time after the end of exposure. To describe the amount of TTS produced by any particular exposure to noise and to provide the uniform reference for this changing magnitude, the value of TTS two minutes after the cessation of exposure (TTS_2) is commonly used. In this paper an attempt was made to give the corrections for converting TTS_t (TTS measured t minutes after the end of exposure) to TTS_2. Ten subjects with normal hearing acuity were exposed to white noise at a level of 105 dB under the following conditions, and TTS were measured 15,30,90,120,240 and 480 seconds after the end of each exposure. Exposure time Test freq. [table] The amounts of TTS_2 at 4 kHz obtained by these exposures were in the range of 0∼5 dB, 5∼10 dB, 10∼20 dB, 20∼30 dB and 30∼40 dB. The recovery of TTS at 4 kHz proceeded faster at first (during the first 1 or 2 minutes) and slower later. It was also shown that tne rates of recovery of TTS at 1,2,4 and 6 kHz were approximately the same when the values of TTS_2 were equal. On the basis of recovery data thus obtained, the relation between TTS_t and TTS_2 were determined graphically with TTS as parameter.
社団法人日本産業衛生学会の論文
1969-08-20