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500 minutes actinium air is equilibrium amount of air Amount of daughter amount of Ra amount there remains Atomkernergie atoms are collected atoms decayed background Catolica de Chile changing pumping velocity cosmic radiation counting geometry counts due Curie per m3 Curie/m3 daughter atoms daughter product decay constants decayin emanations equilibrium in air Erich Bagge experiment with long experimental curve filter following values formula 4.5 half-life-time HEILMAIER integral curve linear Liter air Liter of air long compared long living substances long pumping m3 air minutes of pumping natural series NB(T Noble Gases number of atoms number of counts number of daughter number of desintegrations numerical values obtained parent product product per Liter Ra B atoms radioactive substances Radium products Radon and Thoron ratio relation Santiago de Chile semi-theoretical expression short pumping substances as Sr90 Substracting Taking in account Th B atoms theoretical Thorium products total amount total number UNESCO