| Autor: |
Scharf, A., Akhmadaliev, S., Arnold, M., Bohleber, P., Leya, I., Merchel, S., Rugel, G., Smith, T., Ziegenrücker, R., Zipf, L. |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
DPG-Frühjahrstagung 2016, Sektion AMOP, 29.02.-04.03.2016, Hannover, Deutschland |
| Popis: |
DREAMS, the DREsden AMS-facility, is performing routine accelerator mass spectrometry for the isotopes 10Be, 26Al, 36Cl, 41Ca and 129I. Sample ratios of 10Be/9Be as low as 8 x 10-15 (background-corrected) have been measured and an exposure age of about 330 years of a boulder of 3000 t in Nepal could be determined [1]. We could demonstrate that a by-product of ice core drilling, so-called drilling chips, are also suitable for 10Be analysis of ice cores, instead of using valuable ice core samples. A set of several in-house 26Al and 41Ca standards has been made traceable to primary standards by cross-calibration [2]. Numerous 26Al and 41Ca concentrations of meteorites could be determined, but for marine sediments there is still a need for a low-level (10-13) 26Al standard. ICP-MS measurements have shown that the steel pins used to fix the CaF2 sample material in the cathodes have high K-concentrations of (44.6 ± 2.2) μg/g. By replacing the steel pins with copper pins the 41K background during 41Ca measurements could be lowered by a factor of three. Ref. : [1] W. Schwanghart et al., Science (2015), DOI:10.1126/ science. aac9865. [2] G. Rugel et al., Nucl. Instr. Meth.B (2015), in review. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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