Volcanic Output of Long-Lived Radon Daughters

International audienceThe concentrations of long-lived radon daughters have been measured in the exhausts of 11 volcanoes 11,104 LAMBERT ET AL.' RVEAC MAGMATIC PHASE 238 226 U Ra 92 88 Short-lived daughters VOL&TILE PHASE 222 86 21 0pb The undetectable activity is revealed through the apparent 20 years half-life in the activities •3 of Z10Bi and a of 210po ' 210 82 Ph (RaD) 210 Zi0 An excess of Bi/ Pb is revealed by a S d-decay of the •3 activity An excess of 210po/Z10pb is revealed by a 138 d-decay of the a activity