Be-10 results from Trondheim 1 MV AMS

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.