scope:

This part of ISO 11665 outlines guidance for measuring radon-222activity concentration and the potential alpha energy concentrationof its short-lived decay products in the air. The measurementmethods fall into three categories: a) spot measurement methods; b)continuous measurement methods; c) integrated measurement methods.This part of ISO 11665 provides several methods commonly used formeasuring radon-222 and its short-lived decay products in air. Thispart of ISO 11665 also provides guidance on the determination ofthe inherent uncertainty linked to the measurement methodsdescribed in its different parts.