ISO 11665-11:2016

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ISO 11665-11:2016 is an International Standard that specifies methods for measuring radon-222 activity in soil gas samples collected at depths between the surface and 2 meters. It details both passive and active sampling techniques, including grab and continuous sampling, for determining radon-222 activity in soil gas. The standard is applicable to soil gas samples with radon activity concentrations greater than 100 Bq/m³.