NF C19-117-4*NF EN 61577-4:2015
輻射防護(hù)儀器 氡和氡衰變產(chǎn)物測(cè)量?jī)x器 第4部分:用于生產(chǎn)含有氡同位素及其衰變產(chǎn)物的參考大氣的設(shè)備(STAR)
Radiation protection instrumentation - Radon and radon decay product measuring instruments - Part 4 : equipment for the production of reference atmospheres containing radon isotopes and their decay products (STAR)