Noise and Vibration Flashcards

How is daily noise exposure typically measured on a construction site?

Answer: Using a sound level meter or personal noise dosimeter

Daily noise exposure is measured using calibrated sound level meters (for task-based measurements) or personal noise dosimeters (worn by the worker throughout the shift). Measurements must be carried out by a competent person and the equipment must be properly calibrated.

What is 'vibration white finger'?

Answer: A vascular component of HAVS where blood vessels in the fingers spasm, causing them to turn white, particularly in cold conditions

Vibration white finger (VWF) is the vascular component of HAVS. The blood vessels in the fingers go into spasm when exposed to cold, causing the fingers to turn white and become numb. It is caused by prolonged use of vibrating tools and is a prescribed industrial disease in the UK.

What obligation does an employer have regarding the provision of hearing protection at the upper exposure action value of 85 dB(A)?

Answer: The employer must ensure hearing protection is provided AND worn by all exposed workers

At or above the upper exposure action value of 85 dB(A), employers must ensure that suitable hearing protection is not only provided but actually worn by all exposed workers. This is a mandatory requirement, unlike at the lower action value where hearing protection only needs to be made available.

Which of the following is NOT a duty on employees under the Control of Noise at Work Regulations 2005?

Answer: Carry out their own noise risk assessment

Under the Regulations, employees must use hearing protection and other noise control equipment as instructed, report defects, and cooperate with the employer. However, carrying out the noise risk assessment is the employer's duty, not the employee's.

What is the recommended approach to selecting hearing protection under the Noise Regulations?

Answer: Select hearing protection that reduces exposure to between 75 and 80 dB(A) at the ear — avoiding both over-protection and under-protection

HSE guidance recommends selecting hearing protection that reduces exposure at the ear to between 75 and 80 dB(A). Over-protection (reducing below 70 dB) can cause isolation, meaning workers cannot hear warnings or communicate, creating other safety risks. Under-protection leaves workers at risk of hearing damage.

What is the trigger point for health surveillance for workers exposed to hand-arm vibration?

Answer: Regular exposure at or above the exposure action value of 2.5 m/s² A(8), or where there is a risk of HAVS for any other reason

Health surveillance must be provided for workers regularly exposed at or above the HAV exposure action value of 2.5 m/s² A(8), or where there is a risk of HAVS for any other reason (for example, workers with pre-existing conditions). Surveillance includes questionnaires, clinical assessments, and standardised testing.