Luftkvalitet

This document specifies requirements for the evaluation of measuring procedures using samplers for the determination of a chemical agent present in the workplace atmosphere as a mixture of airborne particles and vapours.
The procedures given in this document provide results only for the sum of airborne particles and vapours. The concentration is calculated in terms of mass per unit volume.
NOTE Examples of substances which can be present in multiple phases are toluene diisocyanate, diethanolamine, ethyleneglycol or tributhylphosphate.
This document can also be applied to complex mixtures, such as metal working fluids or bitumen fumes.
This document is applicable to samplers and measuring procedures using these samplers in which sampling and analysis are carried out in separate stages.

This document provides guidance for:
— the sampling process of the aerosols in the air using filter media. This documentrt takes into account the specific behaviour of aerosols in ambient air (Annex B);
— the determination of the activity concentration of aerosols in the air knowing the activity deposited in the media filter;
— the operating use of continuous air monitoring devices used for real time measurement.
The activity concentration is expressed in becquerel per cubic metre (Bq∙m-3).
This document does not cover the details of measurement test techniques (gamma spectroscopy, global alpha and beta counting, liquid scintillation, alpha spectrometry) used to determine the activity deposited in the media filter, which are either based on existing standards or internal methods developed by the laboratory in charge of those measurements. Also, this document does not cover the variability of the aerosol sizes as given by the composition of the dust contained in ambient air [3],[4].
The procedures described here facilitate the sampling of aerosol bound radionuclides. It is supposed to conform to the national and international requirements for monitoring programmes safety standards of IAEA [5].
The characteristics of the sampling location (coordinates, type of vegetation, obstacles) need to be documented prior to commencing the monitoring. The guidelines of WMO include the criteria for representative measurements of temperature, wind-speed, wind direction, humidity and precipitation for all the weather stations in the world [6].