SIS-CEN-ISO/TR-22930-1 Evaluating the performance of continuous air monitors - Part 1: Air monitors based on accumulation sampling techniques (ISO/TR 22930-1:2020)

SIS-CEN-ISO/TR-22930-1 - 2021 EDITION - CURRENT


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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 a 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. The knowledge of a few factors is needed to interpret the response of a CAM and to select the appropriate CAM type and its operating parameters. Among those factors, it is important to know the half-lives of the radionuclides involved, in order to select the appropriate detection system and its associated model of evaluation. CAM using filter media accumulation sampling techniques are usually of two types: a) fixed filter; b) moving filter. This document first describes the theory of operation of each CAM type i.e.: — the different models of evaluation considering short or long radionuclides half-lives values, — the dynamic behaviour and the determination of the response time. In most case, CAM is used when radionuclides with important radiotoxicities are involved (small value of ALI). Those radionuclides have usually long half-life values. Then the determination of the characteristic limits (decision threshold, detection limit, limits of the coverage interval...

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13.280 (Radiation protection Including protection against radio-frequency radiation Radiation measurements, see 17.240)

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Designation Name

SIS-CEN ISO/TR 22930-1:2021

Revision Level

2021 EDITION

Status

Current

Publication Date

Sept. 3, 2021

Language(s)

English

Page Count

64