NF M60-766:2012
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测定平均活性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.