AMS <sup>10</sup>Be测量本底研究和改进

AMS ¹⁰Be测量本底研究和改进

摘要: 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AMS ¹⁰Be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。

Abstract: 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.