MPLs were proposed on the basis of possible hearing damage risk, and the presence or absence of subjective effects for measured spectra. If band levels were below 75 dB for the one-third-octave bands centred at 8, 10, 12 and 16 kHz, then no subjective effects would be expected. Symptoms including nausea, fullness in the ears, tinnitus and persistent headaches would be avoided. A tentative extrapolation of DRCs (current at the time) suggested that
8 hour exposures to levels of 110 dB in the 20 kHz, 25 kHz and 31.5 kHz bands would not result in hearing loss in the audible frequencies.
Tinnitus klachten door kattenverjager:
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mosquito
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Tinnitus klachten door kattenverjager:
http://www.isvr.co.uk/reprints/Lawton-ISVR-TR334.pdf
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GeneraalPutlucht
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- Lid geworden op: 18-10-2014 13:05