用于高灵敏度AMS<sup>10</sup>Be测量的气体探测器

用于高灵敏度AMS¹⁰Be测量的气体探测器

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。为更好地开展岩石暴露年龄测定和黄土中¹⁰Be浓度测量等应用研究，北京大学加速器质谱（PKUAMS）在深入研究离子鉴别物理过程的基础上，设计研制了1台气体探测器，¹⁰Be高能端测量效率达90%以上，¹⁰Be粒子计数率明显增加。在离子源引出只有1.2 μA（最大值可达2 μA）的情况下，标准样品NIST的¹⁰Be粒子计数率已达23 s^-1。

Abstract: Accelerator mass spectrometry (AMS) is a powerful tool on many research fields and ¹⁰Be is one of the most important isotopes measured by AMS. To meet the requirement of the research project of exposure age and ¹⁰Be contents in loess, a gas detector was developed at PKUAMS. With this new detector the measurement efficiency of ¹⁰Be ions is about 90% and counting rate can reach 23 s^-1 for BeO^- current of 1.2 μA from the ion source and for NIST standard samples.