ISO 11665-4-2020 环境中放射性的测量 - 空气:氡-222 - 第4部分:使用被动采样和延迟分析确定平均活动浓度的综合测量方法
Measurement of radioactivity in the environment — Air: radon-222 — Part 4: Integrated measurement method for determining average activity concentration using passive sampling and delayed analysis