Industrial Hygiene Flashcards

What does TLV-TWA stand for in industrial hygiene?

Answer: Threshold Limit Value - Time-Weighted Average

TLV-TWA (Threshold Limit Value - Time-Weighted Average) is the ACGIH-defined concentration for a normal 8-hour workday and 40-hour workweek to which workers may be repeatedly exposed without adverse effects.

Which sequence correctly describes the industrial hygiene paradigm?

Answer: Recognize, Evaluate, Control

The industrial hygiene paradigm follows Recognize, Evaluate, and Control — you must first identify a hazard, then assess its magnitude, before implementing controls.

OSHA's Permissible Exposure Limit (PEL) for occupational noise is:

Answer: 90 dBA as an 8-hour TWA

OSHA's PEL for occupational noise exposure under 29 CFR 1910.95 is 90 dBA as an 8-hour time-weighted average.

Which type of ventilation captures contaminants at their source before they disperse into the work environment?

Answer: Local exhaust ventilation

Local exhaust ventilation (LEV) captures contaminants at or near their point of generation, preventing them from entering the workplace atmosphere.

ACGIH Biological Exposure Indices (BEIs) are used to:

Answer: Evaluate biological monitoring results from worker specimens

BEIs are reference values for evaluating biological monitoring results, representing determinant levels expected in specimens from healthy workers exposed at the TLV.

The term 'LD50' in toxicology refers to:

Answer: The lethal dose that kills 50% of a test population

LD50 (Lethal Dose 50) is the amount of a substance required to kill 50% of a test animal population, used as a standard measure of acute toxicity.

Which sampling strategy provides the most accurate full-shift TWA exposure assessment?

Answer: Full-period consecutive sampling

Full-period consecutive sampling collects the air sample throughout the entire work shift with no gaps, providing the most accurate time-weighted average exposure.