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MS: Fachverband Massenspektrometrie

MS 6: Accelerator Mass Spectrometry and Applications I

MS 6.2: Vortrag

Mittwoch, 8. März 2017, 15:00–15:15, RW 2

¹⁰Be results from Trondheim 1 MV AMS — •Martin Seiler¹, Johanna Anjar¹, Einar Vaernes¹, Marie-Josée Nadeau¹, and Grazia Scognamiglio² — ¹National Laboratory for Age Determination, NTNU, Trondheim — ²Centro Nacional de Aceleradores, Universidad de Sevilla, Sevilla

The 1 MV AMS system in Trondheim is regularly used for radiocarbon dating and provides stable measurement conditions for reliable results. The initial acceptance tests was conducted for ¹⁰Be, ²⁶Al and ¹⁴C. However, for many years only ¹⁴C was measured. Recently the first tests with ¹⁰Be were done. The 2⁺2⁺ measurement setup with a 150 nm thick degrader foil yielded a good efficiency as well as a low background level and was therefore chosen for further measurements. In order to determine the achievable performance under measurement conditions, several samples have been run in an ordinary measurement. This includes primary standards, which were used for normalization of the other samples. The precision for a single sample was 0.5 % at a nominal ratio of ¹⁰Be/Be 2.709·10⁻¹¹. Secondary standards with ¹⁰Be/Be ratios between 5·10⁻¹³ and 9·10⁻¹² were used to prove the accuracy of the measurement. As we aim to measure samples for cosmogenic exposure dating, the background level for rock samples was determined with process blanks of a Be extraction process from quartz were used. The average normalized blank level for these samples was 3·10⁻¹⁵. A detailed analysis of the performance as well as an outlook to real sample applications will be given.