222Rn / 220Rn is a radioactive gas full of everywhere on Earth,the study of 222Rn / 220Rn has been an important issue in radiation protection and environmental protection. At present, the accurate measurement of 222Rn is already built up,but the measurement standards of 220Rn concentration has not been fully established yet. The joint measurement of 222Rn / 220Rn concentration can be mainly divided into double membrane spectroscopy, delay method using scintillation cells, parallel measurement using solid state nuclear track detector, activated carbon filter paper method and electrostatic collection method. At home and abroad 222Rn / 220Rn comeasuring instrument mainly includes FD - 129 222Rn / 220Rn detector,LR - 115 solid state nuclear track detcctors,RAD7 radon monitor,and so on.%氡是地球上无处不在的放射性气体,对222Rn/220Rn问题的研究一直是辐射防护和环境保护的重要课题.目前国内外222Rn测量仪比较成熟,而220Rn的测量标准还没有建立起来.222Rn/220Rn联合测量主要分为双滤膜能谱法、闪烁室延时法、α径迹蚀刻法、活性炭盒λ谱法、活性炭滤纸法、静电收集法.国内外222Rn/220Rn联合测量仪主要包括FD-129型氡钍射气测定仪、LR-115固体核径迹探测器、RAD7测氡仪等.
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