222Rn-Konzentrationen in spring water, sampled monthly during ISHYDRO-project (Centre d'Hydrogéologie de l'Univ. de Neuchâtel, Switzerland) [6]. Springs : 1-Dôle (k), 2-Côte A (k), 3-Côte B (k), 4-Commugny (k & q), 5-Montant (k), 6-Aubonne (k), 7-Bière (q), 8-Venoge (k), 9-Cressonnière (k), 10-Mollendruz (k), 11-Areuse (k), 12-Combe-Garot (k), 13-Payerne (q), 14-Cascade (k), 15-Sandli (k). Characters between brackets mean : k, karst-aquifer, q, alluvial aquifer. 1 sigma counting error is around ± 20 % at 2 Bq/l and less than ± 10 % for concentrations above 5 Bq/l. Detecetion limit is 0.5 Bq/l. (units)