使用连续空气监测器（CAM）的主要动机是，当超过显著的放射性浓度值时，需要以可接受的误报率，以最准确的方式迅速发出警报，以便采取适当措施减少相关人员的暴露。 该CAM的性能不仅取决于以判定阈值、检测极限和测量不确定性为特征的计量方面，还取决于以响应时间为特征的动态能力，以及与可接受的误报率相对应的最小可检测活动浓度。 理想的性能是使最低可检测活性浓度尽可能低，且响应时间非常短，但不幸的是，这两个标准是相反的。因此，重要的是，CAM以及调整参数和报警水平的选择应符合辐射防护目标。 本文件描述了 -动态行为和响应时间的确定， -确定特征限值（判定阈值、检测限值、覆盖区间限值），以及 -确定最小可检测活性浓度和警报设置的可能方法。 最后，本文件的附件显示了CAM数据的实际示例，说明了如何通过确定响应时间、特征限值、最小可检测活动浓度和警报设置来量化CAM性能。

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.