AMS ^(10)Be测量本底研究和改进

Study and Improvement on Background of AMS ^(10)Be Measurement

10Be是加速器质谱(AMS)测量中重要性仅次于14C的核素,在第四纪地质研究等方面发挥着重要作用。为开展岩石暴露年龄测定和黄土中10Be含量测量等应用研究,北京大学加速器质谱(PKUAMS)在设备改进的基础上对10Be测量本底进行了较为系统的研究,使测量本底达到了6×10-15。本工作主要介绍AMS10Be测量本底的主要来源,从提高10Be离子计数率与抑制7Be干扰本底两个方面对10Be测量本底进行了较为系统的研究与改进。

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.