Berlin 2014 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Accelerator Mass Spectrometry and Applications 2

MS 9.2: Vortrag

Donnerstag, 20. März 2014, 14:30–14:45, DO24 1.205

Performance of the modified DREAMS ion source for 36Cl applications — •Stefan Pavetich, Shavkat Akhmadaliev, Silke Merchel, Georg Rugel, and René Ziegenrücker — Helmholtz-Zentrum Dresden-Rossendorf

First analyses of real 36Cl-AMS samples were performed with the newly developed low memory-effect ion source at the DREsden Accelerator Mass Spectrometry (DREAMS) facility [1, 2]. Considerable improvements have been reached with respect to the overall ion source performance. Especially, parameters like current output, ion source fractionation effects, normalization factors, blank values and sulphur suppression factors have been investigated to enhance accuracy of 36Cl-data.

Applications cover a wide spectrum, which implies also highly variable 36Cl/35+37Cl-ratios ranging from nearly background level of ∼10−15 up to 10−10. Samples from aquifers in arid regions for groundwater dating and modelling were analysed. Meteorite samples were measured to investigate the constancy of the galactic cosmic radiation, production rates from sulphur, and reconstruction of exposure histories of individual meteorites.

Acknowledgements: C. Wilske, B. Merkel (TUBAF), T. Müller (UFZ), U. Ott (MPI Mainz), T. Smith (U Bern), G. Domènech i Surinyach (U Barcelona), DREAMS-Operators.

[1] S. Pavetich et al., NIMB, submitted.

[2] Sh. Akhmadaliev et al., NIMB 294 (2013) 5.

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