1The 36 Cl/Cl ratios of groundwater samples were measured by AMS in order to investigate 2 the potential use of 36 Cl as a dating tool for modern groundwater. Groundwater samples were 3 obtained from several piezometers in the Oderbruch in northeastern Germany. The shallow 4 confined aquifer of the area is mainly recharged by the infiltration from the River Oder. From 5 the results of measurements, the pre-bomb and the recent background 36 Cl/Cl ratios in the basin 6 of the Oder were estimated to be 7-9 × 10 −14 . The 36 Cl fallout values estimated from the 36 Cl/Cl 7 ratios of the Oderbruch samples, which were dated by the 3 H/ 3 He method, show good agreement 8 with Dye-3 ice core data. These results suggest that the distribution of 36 Cl in groundwaters 9 reflects the influence of the 36 Cl bomb pulse. This, in turn, suggests that the distribution of 10 36 Cl/Cl in modern groundwaters could reveal groundwater ages and flow systems in a region. 11 12 PACS: 92.40.Kf; 91.67.Qr; 93.30.Ge; 06.60.Ei 13

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