COMMERCE 4BL3 Chapter 5: Chapter 5.docx

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Physical agents: sources of energy that may cause injury or disease (ex: noise vibration, radiation & extremes in temp & pressure) Ambient: all-encompassing condition associated w/ a given env"t, being usually a composite of inputs from sources all around us. Human hearing response is conditional on 3 characteristics: frequency, duration & loudness. Threshold shift (tts): gradual hearing loss can sometimes be reversed by removal from the noise source. Threshold shift (pts): identifies a hearing disability that is perm & may not be correctable. Noise exposure standards: vary across provinces, mostly around 85db w/ a. 3db exchange rate, w/ an 8-hour exposure limit. Exchange rate: represents the doubling of the sound power, which req. halving the exposure time (4 hours) if stnd is 85db for 8 hours, the worker can work at 88db for 4 hours. The sensitivity of a person"s hearing or degree of hearing loss. Vwf = vibration-induced white finger due to working w/ power tools in the cold.

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