Berlin 2001 – scientific programme

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MS: Massenspektrometrie

MS 2: Accelerator Mass Spectrometry 2

MS 2.2: Talk

Monday, April 2, 2001, 17:45–18:00, EB 202

Measurement of ³⁶Cl in lakes — •V. Lazarev¹, A. Blinov², Th. Huber¹, F. Kubo¹, and E. Nolte¹ — ¹Fakultät für Physik, E15, TU München — ²St. Petersburg State Technical University, Russia

The ³⁶Cl deposition fluxes, experimentally determined by measurements of this isotope in annual precipitations at the locations, distributed over a wide range of latitudes, showed a significant discrepancy over the fluxes, calculated from cosmic ray induced production in the atmosphere. To explain the observed difference the recycling of nuclear bomb produced ³⁶Cl as an additional source of ³⁶Cl is suggested. The hypothesis is to be checked by measuring ³⁶Cl concentrations in lakes with long flushing times, operating as integrating systems. The first measurements have been performed. The results are in good agreement with the expected values. In Alpine lakes with flushing times of about 10 years the contribution of ³⁶Cl, produced by Chernobyl accident, is prevailing. In contrast, in the lakes with longer flushing times the natural and the bomb-produced input are dominant.