EVS-EN ISO 11665-6:2015

This part of ISO 11665 describes radon-222 spot measurement methods. It gives indications for carrying out
spot measurements, at the scale of a few minutes at a given place, of the radon activity concentration in open
and confined atmospheres.
This measurement method is intended for rapid assessment of the radon activity concentration in the air.
The result cannot be extrapolated to an annual estimate of the radon activity concentration. This type of
measurement is therefore not applicable for assessment of the annual exposure.
The measurement method described is applicable to air samples with radon activity concentration greater
than 50 Bq/m3.
NOTE For example, using an appropriate device, the radon activity concentration can be spot measured in the soil
and at the interface of a material with the atmosphere (see also ISO 11665-7).