Study and Improvement on Background of AMS ¹⁰Be Measurement

Accelerator mass spectrometry (AMS) is a powerful tool on many research fields and 10Be is one of important isotopes measured by AMS. For the research project of exposure age and 10Be contents in loess, facility improvements and background investigation were carried out with EN tandem accelerator based AMS at Peking University and the machine background reaches to the level of 6×10^-15. In the paper, the background comparison of different kinds of AMS system was summarized. The efforts to increasing 10Be ions counting rate and suppressing 7Be interference were also described.