Abstract
The Daily Noise Dose (DND) is a single‐member rating for measuring the degree to which a worker has been exposed to noise. But although it is a single number, the DND is based on a distribution of sound levels that is determined by the noise in the various environments where the worker may spend time. The DND thus obscures the statistical nature of worker noise exposure, and cannot, by itself. be used as an analytical tool for determining the relative contributions of the major sources of noise that the worker is exposed to. Furthermore, there typically is no estimate of the error or confidence in a given DND measurement. This paper will introduce the concept of an incremental noise dose dn, a random variable: derived from the sound level distribution. As a random variable, ordinary statistics such the mean and variance can be determined. Confidence intervals can be calculated as a measure of accuracy. Other sources of error, such as calibration error, sound level meter or dosimeter imprecision, and operator bias will be discussed.
Published Version
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