IEC 61577-2:20 14描述了测量室外、住宅和工作场所（包括地下矿山）空气中222Rn和220Rn活性浓度的仪器的具体要求。本标准实际上适用于基于点或连续测量的所有类型的电子测量仪器。IEC 61577-1中规定了用于测量的不同类型的仪器。与上一版相比，此新版本包括以下重大技术变更: -增加有关性能的新要求和测试； -使有关性能的要求和测试与这一领域的其他标准相协调。

IEC 61577-2:2014 describes the specific requirements for instruments measuring the activity concentration of airborne ²²²Rn and ²²⁰Rn outdoors, in dwellings and in workplaces including underground mines. This standard applies practically to all types of electronic measuring instruments that are based on either spot or continuous measurements. The different types of instrumentation used for measurements are stated in IEC 61577-1. This new edition includes the following significant technical changes with respect to the previous edition:
- addition of new requirements and tests concerning performance;
- harmonization of the requirements and tests concerning performance with other standards in this area.