scope:

This part of ISO 11665 describes integrated measurement methodsfor short-lived radon-222 decay products[4]. It gives indicationsfor measuring the average potential alpha energy concentration ofshort-lived radon-222 decay products in the air and the conditionsof use for the measuring devices. This part of ISO 11665 coverssamples taken over periods varying from a few weeks to one year.This part of ISO 11665 is not applicable to systems with a maximumsampling duration of less than one week. The measurement methoddescribed is applicable to air samples with potential alpha energyconcentration of short-lived radon-222 decay products greater than10 nJ/m3 and lower than 1 000 nJ/m3.