In order to convert the reading of a dosimeter into TWA, see Table A-1, below. The amount of such exposure is usually measured with an audiodosimeter which gives a readout in terms of "dose." In order to better understand the requirements of the amendment, dosimeter readings can be converted to an "8-hour time-weighted average sound level." (TWA). Conversion Between "Dose" and "8-Hour Time-Weighted Average" Sound LevelĬompliance with paragraphs (c)-(r) of this regulation is determined by the amount of exposure to noise in the workplace. Where L is the measured A-weighted sound level. In the above table the reference duration, T, is computed by (3) A table relating dose and TWA is given in Section II. For an eight-hour workshift with the noise level constant over the entire shift, the TWA is equal to the measured sound level. (2) The eight-hour time-weighted average sound level (TWA), in decibels, may be computed from the dose, in percent, by means of the formula: TWA = 16.61 log 10 (D/100) + 90. Where C n indicates the total time of exposure at a specific noise level, and T n indicates the reference duration for that level as given by Table G-16a. (ii) When the workshift noise exposure is composed of two or more periods of noise at different levels, the total noise dose over the work day is given by:ĭ = 100(C 1 / T 1 + C 2 / T 2 + C n / T n), (i) When the sound level, L, is constant over the entire work shift, the noise dose, D, in percent, is given by: D=100 C/T where C is the total length of the work day, in hours, and T is the reference duration corresponding to the measured sound level, L, as given in Table G-16a or by the formula shown as a footnote to that table. (1) Noise dose is computed using Table G-16a as follows: Appendix A to § 1910.95 - Noise Exposure Computation
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