ISO 11665-2:2012
Measurement of radioactivity in the environment -- Air: radon-222 -- Part 2: Integrated measurement method for determining average potential alpha energy concentration of its short-lived decay products
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ISO 11665-2:2012 covers samples taken over periods varying from a few weeks to one year. ISO 11665-2:2012 is not applicable to systems with a maximum sampling duration of less than one week.