本项目将利用超级卤素负离子的性质，探索在 3MV的Xi'an-AMS上进行Be放射性同位素测量的新方法。通过建立含Be与F的盐类化合物化学制样流程，从而避免BeO制样的弊端，并运用辅助介质法与其混合制成可产生超级卤素负离子靶样进行AMS测试分析。项目将重点研究以Be的超级卤素负离子BeF3-为引出束流的Be放射性同位素AMS测量新方法，从而去除7Be测量中7Li的干扰，有效抑制10Be测量中10B的干扰；以此分别实现在高能端无辅助二次剥离薄膜条件下10Be-AMS与7Be-AMS测量。并将获得的10Be测量结果与传统BeO样品测量结果进行对比；运用超级卤素负离子方法7Be-AMS测量结果与γ能谱法测量结果进行交叉检验。最终实现运用AMS对同一样品、同时进行7Be与10Be测试分析的目标，服务于Be同位素的环境示踪研究。

In this project, a new method of measuring radioactive isotopes of beryllium (Be) by accelerator mass spectrometry (AMS) will be studied. This method uses the super-halogen anion of beryllium for accelerator mass spectrometry measurement; the experiments are to be carried out using the 3MV AMS system at the Xi'an-AMS Center, Institute of Earth Environment, CAS. The preparation procedure of salt samples which contain Be and F elements will be established, which could be more straightforward than the standard BeO sample preparation process. This Be-F containing salt could be either BaBeF4 or Ca(Be)F2, which can be further distributed in a PbF2 matrix to enhance the production of beryllium super-halogen anion BeF3-. Using BeF3-, the 7Li interference for 7Be-AMS measurement is mostly absent, and the 10B interference for 10Be-AMS measurement is also naturally suppressed by a large extent. The measurement of 10Be and 7Be by AMS could therefore be made at the same time, without the use of energy-degrader foils in the high energy analysis line of an AMS system. The new method for 10Be analysis can be evaluated against the well established BeO method of 10Be-AMS, and that for 7Be analysis can be calibrated against the traditional γ-ray counting method for 7Be analysis. Once established, this new analytical method will be the first for both 7Be and 10Be to be determined by AMS, from the same sample and at the same time.