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3 Cards in this Set
- Front
- Back
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Outline THREE ways in which noise exposure can be controlled. |
Noise exposure can be controlled in three ways: Reduce the noise at source Interrupt the pathway from source to receiver Protect the receiver |
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Identify TWO types of noise meter that can be used to undertake noise measurements. |
Types of noise meter that can be used to undertake noise measurement include: Simple sound level meter Integrating sound level meter Dosimeters |
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4. A number of workers have been using vibrating hand-held tools for lengthy periods during a shift. They have reported discomfort in their fingers and hands. A medical examination shows that the workers concerned could be showing early symptoms of hand-arm vibration syndrome (HAVs). (i) Identify the typical symptoms that might be shown by affected individuals. (4 marks) (ii) Outline factors to consider when assessing the risk of HAVs developing among the workers. (8 marks) (iii) Outline the precautions that may be used to minimise the risk of workers developing the condition. (8 marks) |
4. (i) Typical symptoms of exposure to vibration that might be identified: Tingling and numbness of the fingers. Reduced sensory perception and inability to feel (parasthesia). Swollen and painful joints. Reduction in dexterity and strength. Fingers blanching and becoming red and painful on recovery (especially when cold and wet; fingers tips most likely to be affected first). (ii) Factors to consider during assessment are: The sources of vibration, e.g. types of tools and equipment. Information from manufacturers. Information on the characteristics of the vibration, i.e. frequency, magnitude and direction of vibration. Contact time or period of use. Environmental factors, e.g. exposure to cold conditions. Use of force to hold tool against material being processed. Personal factors, e.g. any previous circulation problems. An assessment of the current control measures (precautions) being used. (iii) Control measures used to minimise the risk of adverse health effects: Elimination by use of alternative work methods, mechanisation and automation. Substitute tools with those producing lower vibration. Adjusting work schedules to reduce time of exposure of the workers. Regular breaks with job rotation. Introduce a programme of planned preventative maintenance for the tools. Introduce a defect reporting system. Provide appropriate PPE, e.g. gloves to keep the hands warm during work. Carry out the work in a warmer environment. Give information and instruction to workers on the correct working method. |
