Definition of Safety & Compliance Terms

Action Level
The exposure level to which corrective action must be taken
ACGIH
American Conference of Governmental Industrial Hygienists
Ambient
An encompassing atmosphere: environment
Ceiling
The concentration that should not be exceeded during any part of the working exposure. It may be assessed by sampling over a period of time that should not exceed 15 minutes.
CDC
Center for Disease Control
Diffusion
The process whereby particles of liquids, gases, or solids intermingle as the result of their spontaneous movement
Dosimeter
A device for measuring doses of radiation or hazardous vapors
Excursion
One complete movement of expansion and contraction of the lungs
JCAHO
Joint Commission on Accreditation of Healthcare Organizations
NFPA
National Fire Protection Association
NIOSH
National Institute for Occupational Safety and Health
OSHA
Occupational Safety and Health Administration
PPM
Parts Per Million
Passive
Without the intervention of mechanical devices
PEL
Permissible Exposure Limit
STEL
Short Term Exposure Limit: The concentration to which it is believed that workers can be exposed continuously for a short period of time without suffering adverse effects.
TLV
Threshold Limit Value: The point at which a physiological effect begins to be produced
TWA
Time Weighted Average: The concentration for a conventional 8-hour workday and a 40-hour workweek, to which it is believed that nearly all workers may be repeatedly exposed, day after day, without adverse effects

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