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CEN ISO/TR 22930-2:2021 Edition 08/2021
Evaluating the performance of continuous air monitors - Part 2: Air monitors based on flow-through sampling techniques without accumulation (ISO/TR 22930-2:2020)
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Abstract

The use of a continuous air monitor (CAM) is mainly motivated by the need to be alerted quickly and in the most accurate way possible with an acceptable false alarm rate when significant activity concentration value is exceeded, in order to take appropriate measures to reduce exposure of those involved. The performance of this CAM does not only depend on the metrological aspect characterized by the decision threshold, the limit of detection and the measurement uncertainties but also on its dynamic capacity characterized by its response time as well as on the minimum detectable activity concentration corresponding to an acceptable false alarm rate. The ideal performance is to have a minimum detectable activity concentration as low as possible associated with a very short response time, but unfortunately these two criteria are in opposition. It is therefore important that the CAM and the choice of the adjustment parameters and the alarm levels be in line with the radiation protection objectives. This document describes — the dynamic behaviour and the determination of the response time, — the determination of the characteristic limits (decision threshold, detection limit, limits of the coverage interval), and — a possible way to determine the minimum detectable activity concentration and the alarms setup. Finally the annexes of this document show actual examples of CAM data which illustrate how to quantify the CAM performance by determining the response time, the characteristics limits, the minimum detectable activity concentration and the alarms setup.

Status

Standard - Active

Origin

Technical Committee :
CEN/TC 430 : Nuclear energy, nuclear technologies, and radiological protection

Implementation

start of the vote on the project      date of ratification (dor)    16/08/2021
end of the vote on the project      date of anouncement (doa)   
start of the vote on the final project    22/04/2021   date of publication (dop)   
end of the vote on the final project    15/07/2021   date of withdrawal (dow)   


Publication Official Journal
of the Grand-Duchy of Luxembourg
Reference

International Classification for Standards (ICS codes) :

13.280 : Radiation protection
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