Accelerator mass spectrometry of 26 Al at 6 MV using AlO − ions and a gas-filled magnet
| Autor: | Klaus-Ulrich Miltenberger, Christof Vockenhuber, Arnold Milenko Müller, Hans-Arno Synal, Martin Suter |
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| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Chemistry 010401 analytical chemistry Analytical chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Ion Yield (chemistry) Ionization Magnet Ionization chamber Atomic physics Instrumentation FOIL method Order of magnitude Accelerator mass spectrometry |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 406:272-277 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/j.nimb.2017.02.013 |
| Popis: | For accelerator mass spectrometry (AMS) measurements of 26Al the use of AlO− ions holds considerable promise given their ionization yield which is about an order of magnitude higher compared to the commonly used Al− ions. However, the strong isobaric interference introduced by 26MgO− ions must be reduced before the identification in a gas ionization chamber (GIC). At the ETH Zurich 6 MV EN-TANDEM accelerator the foil degrader method as well as the gas-filled magnet (GFM) method were systematically investigated with respect to suppression of 26Mg and acceptance of 26Al. Additionally a new, large-acceptance GIC was designed to capture as large a fraction of the broad beams as possible. The GFM method achieves a 26Mg suppression factor of 10 3 and an acceptance of 26Al of > 50 % and therefore provides a significant advantage over the degrader foil method ( s Foil ( 26 Mg ) ≈ 3 · 10 2 , τ Foil ( 26 Al ) ≈ 30 % ). In combination with the 26Mg separation of 10 4 in the GIC it is now possible to measure samples with a Mg content in the ppm range down to 26Al/27Al ≈ 10 - 14 with an overall efficiency that is approximately 5 × improved with respect to the previous TANDEM setup. |
| Databáze: | OpenAIRE |
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