DIN ISO 11665-4:2021
环境中放射性的测量. 空气: 镭-222. 第4部分: 使用被动采样和延迟分析确定平均活性浓度的综合测量方法(ISO 11665-4-2020)
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 (ISO 11665-4:2020)