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Definition of Term
  
absolute zero: The temperature at which all molecular motion stops. Either -273.15°C (0 K) in the SI system of units, or -459.67°F (0°R) in the English system.
  
acceptance sampling: The procedures by which decisions to accept or reject a sampled lot or population are made based on the results of a sample inspection. In air pollution work, acceptance sampling could be used when checking a sample of filters for certain measurable characteristics such as pH, tensile strength, or collection efficiency to determine acceptance or rejection of a shipment of filters, or when checking the chemical content of a sample of vials of standard solutions from a lot of vials to be used in an interlaboratory test.
  
Occupational Safety and Health Act (OSH Act) of 1970: In 1970, the U.S. Congress passed the OSH Act “to assure safe and healthful working conditions for working men and women by authorizing enforcement of the standards developed under the Act; by assisting and encouraging the states in their efforts to assure safe and healthful working conditions; by providing for research, information, education, and training in the field of occupational safety and health; and for other purposes” (Public Law 91–596).
  
optical density (OD): The quantity used to specify the ability of protective eyewear to attenuate optical radiation, where OD = log10 (ML/EL).
  
detector tube system: A measuring device that consists of a pump and a detector tube. Accessories such as stroke counters, hoses, and probes also might be included. The exception to this is a passive dosimeter, which does not use a pump.