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.<\/p>\n
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.<\/p>\n
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.<\/p>\n
This document describes<\/p>\n
the dynamic behaviour and the determination of the response time,<\/p>\n<\/li>\n
the determination of the characteristic limits (decision threshold, detection limit, limits of the coverage interval), and<\/p>\n<\/li>\n
a possible way to determine the minimum detectable activity concentration and the alarms setup.<\/p>\n<\/li>\n<\/ul>\n
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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4 Symbols <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5 Measuring principle <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6 Study of dynamic behaviour <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7 Evaluation of the characteristic limits 7.1 General 7.2 Single detector 7.2.1 General <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.2.2 Definition of the model 7.2.3 Standard uncertainty <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7.2.4 Decision threshold <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 7.2.5 Detection limit 7.2.6 Limits of the coverage interval 7.3 Double detector 7.3.1 General <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 7.3.2 Definition of the model 7.3.3 Standard uncertainty <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 7.3.4 Decision threshold <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 7.3.5 Detection limit 7.3.6 Limits of the coverage interval 8 Alarms setup, minimum detectable concentration and potential missed exposure <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex A (informative) Application example: Single detector with a proportional counter <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex B (informative) Application example: Double detector in current mode <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Evaluating the performance of continuous air monitors – Air monitors based on flow-through sampling techniques without accumulation<\/b><\/p>\n |