prepared by khen samrith be carful about noise effect, please take care your ear at your work
Post on 05-Jan-2016
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NoiseEffect
To Health
?
Prepared by Khen Samrith
Be carful about noise effect , Please take care your ear at your work
Prepared by Khen Samrith
Protection
Prepared by Khen Samrith
Sound level of airborne sound source
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Individual sensation of sound
Physical fitnessTired or side person feel more disturbed than well –rested or
healthy person
Time sequenceIncreasing and decreasing sounds are more disturbing
than monotonous ones
DurationThe longer a sound lasts , the more disturbing it becomes
Sound pressureThe stronger the sound pressure
, the more disturbing
FrequencyThe higher the frequency the
more disturbing is the sound this is true for sound up to 6000 cps.
Kind of activityIntellectual work is more easily disturbed than physical work
Personal attitude Those who hear involuntarily feel more
disturbed than those who make the noise
Noise Individual
sensation of sound
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Exposure to loud noise will inevitably cause hearing lossover time.
Loud noise damages or destroys the nerves in the inner ear.Another effect can be “tinnitus” or permanent ringing in the ear.
raised blood pressure increased heart rate and stress
resulting in irritability and headaches, an reduced ability to hear malfunctioning equipment, alarm signals or verbal warnings.
including the risks of stroke and heart attack
reduced immune response, and gastric ulcers.
Prepared by Khen Samrith
Prepared by Khen Samrith
Stress related symptoms include: irritability, headaches, moodiness and insomnia, and
disturbance of psychomotor reactions. Exposure to both excessive or low levels of noise can
result in: increased absenteeism reduced productivity due to fatigue and low
concentration increased production costs reduced quality of work/product/service, and reduced ability to communicate, for example,
difficulty in holding a telephone conversation.
When is Noise Too Loud? Noise is measured in units called“decibels” or “dB” If two people 3 feet apart must shout to be heard, the background noise is too loud (above 85
decibels). Noise above 140 decibels causes pain and immediate
hearing loss.
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Long Term Exposure to Noise Our ears can recover from short exposure to loud
noise, but over time nerve damage will occur. The longer and louder the noise, the greater
chance permanent damage will occur. There is really no such thing as “tough ears” or
“getting used to it”.
Prepared by Khen Samrith
Prepared by Khen Samrith
The table below shows noise levels and how long a person can be exposed without hearing protection before there is damage to the ear.
Noise Level Allowable Exposure Time◦85 decibels 8 hours◦90 decibels 4 hours◦100 decibels 1 hour◦105 decibels 30 minutes◦110 decibels 15 minutes◦115 decibels 0 minutes
Daily Allowable Exposure Times to Noise
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Equipment Noise Level
Back Hoe 85-95 decibels Chain Saw 110 decibels Front-end Loader 90-95
decibels Examples of Noisy Equipment Front 90 Gunshot 140 decibels Jackhammer 112 decibels Lawn Mower 90 decibels Tractor 95-105 decibels Circular Saw 90-100 decibels
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Picture of a damaged sheep lung
Non-Auditory Injuries
Healthy
Damaged
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