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In the all kinds of methods,the realization and dissemination of the unit of activity of ~(222)Rn(in the following referred to as radon)has so far been based on the quantitative determination of the radon activity from theα-decay of ~(226)Ra,and on comparison measurements with calibrated radium
In the all kinds of methods, the realization and dissemination of the unit of activity of ~ (222) Rn (in the following referred to as radon) has so far been based on the quantitative determination of the radon activity from the alpha-decay of ~ (226) Ra, and on comparison measurements with calibrated radium