This part of IEC 61 577 describes the specific requirements for instruments measuring the activity concentration of airborne 222 Rn and 220 Rn 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 activity concentration can be measured by pumping or by diffusing the air containing 222 Rn and/or 220 Rn into the sensitive volume of the detection unit or at a particular moment by taking an air sample (grab sampling).
The different types of instrumentation used for measurements are stated in IEC 61 577-1 .
The standard does not apply to instruments using charcoal adsorption, electrets or solid state nuclear track detectors.
