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LIMITE DERIVEE CONCENTRATION AIR [1 record]

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Record 1 - external organization data 2011-05-16

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Radiological Physics (Theory and Application)
  • Compartment - Canadian Nuclear Safety Commission
DEF

The concentration of a radioactive pollutant in air that generates a maximum permissible dose to individuals.

CONT

The permissible limit for inhalation of a radionuclide is the appropriate ALI [annual limit of intake]. This is given in units of activity, Bq. Because it is often easier to measure and control the concentration of radioactvity in the air than to measure or control the intake, the ALIs are used to calculate the Derived Air Concentrations (DACs). The Derived Air Concentration, or DAC for any radionuclide, is that concentration in air, expressed in Bq/m³ which, if worked in for a year (50 weeks of 40 hours each for a total of 2000 hours per year), would result in the ALI for inhalation. The normal breathing rate, based on Reference Man, is 2,400 m³ per year at work. The Derived Air Concentration is the ALI divided by the volume breathed in a year at work.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Physique radiologique et applications
  • Tiroir - Commission canadienne de sûreté nucléaire

Spanish

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