DIN IEC 61577-2-2015 辐射防护装置.氡和氡衰减产品测量装置.第2部分:氡测量装置的特殊要求(IEC 61577-2-2014)
Radiation protection instrumentation - Radon and radon decay product measuring instruments - Part 2: Specific requirements for Rn-222 and Rn-220 measuring instruments (IEC 61577-2:2014)