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CIH – TLV-BEI Book Questions with Solutions 2024
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CIH – TLV-BEI Book
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CIH – TLV-BEI BookThreshold Limit Value - answer Refers to airborne concentrations of chemical
substances and represent conditions under which it is believed that nearly all workers
may be repeatedly exposed, day after day, over a working lifetime, without adverse
health effects
TLV-TWA - answer The TWA concentration for an 8-hour workday and 40-hour
workweek, to which it is believed that nearly all workers may be repeatedly exposed,
day after day, over a working lifetime without adverse effect
TLV-STEL - answer- 15-minute TWA that should not be exceeded at any time during a
workday, even if the 8-hour TWA is within the TLV-TWA. Continuous exposure
concentration without:
o Irritation
o Chronic or irreversible tissue damage
o Dose-rate-dependent toxic effects
o Narcosis of sufficient degree to increase likelihood of accidental injury
TLV-C (threshold limit value-ceiling) - answer Concentration that should not be
exceeded during any part of the working exposure
3/5 rule - answerApplies to TLV-TWAs that do not have a TLV-STEL. Exposures may
exceed 3x the TWA for no more than 15 mins at a time, on no more than 4 occasions
spaced 1 hour apart
Aerosol - answerSuspension of solid particles or liquid droplets in a gaseous medium
Nanomaterials - answerObjects 100nm or smaller in one or more dimension
5 times the value of TWA - answerUnder the 3/5 rule, an exposure above the TWA
cannot exceed __ times the value of the TWA
TLV-C - answerThe best TLV for fast-acting chemicals and short sampling time.
Dust, mist, fume, fog, fiber, smoke, smog - answerName the 7 types of aerosols
Brief and Scala Model - answerRefers to unusual work schedules. The model reduces
the TLV proportionately for increased exposure time and reduced non-exposure time. It
is generally intended to apply to work schedules longer than 8 hours/day or 40
hours/week.
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