An isobar separation method with Q3D magnetic spectrometer for AMS

作者：Li, Chaoli; He, Ming; Jiang, Shan^*; Li, Shizhuo; Gong, Jie; Liu, Jiancheng; Wang, Wei; He, GuoZhu; Wu, Shaoyong; Dong, Kejun; Wang, Xianggao; Shen, Hongtao

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2010, 622(3): 536-541.

DOI：10.1016/j.nima.2010.07.065

• Q3D magnetic spectrometer
• AMS
• Isobar separation
• Suppression factor

Isobar interference is the main obstacle for AMS measurement, especially in the case of very strong isobaric interference, such as in the measurement of Si-32, Mn-53, Fe-60, Ni-63, etc. An isobar separation method with Q3D magnetic spectrometer was developed aiming at AMS measurements for the above-mentioned nuclides. Based on a method of (Delta E-Q3D) the isobaric events can be largely rejected from the region of the nuclide of interest on the focal plane of a Q3D magnetic spectrometer. As a result, the isobaric interference can be reduced by more than three orders of magnitude. Further reduction of isobaric interference can be achieved by the use of a multi-anode ionization chamber placed at the position of collecting the nuclide of interest. The performance of the Delta E-Q3D system for isobar separation was tested by the above-mentioned nuclides with atomic numbers from 14 to 42. The results showed that Delta E-Q3D method has strong capability for separating isobars, as detailed in this paper.

• 出版日期2010-10-21
• 单位广西大学; 中国原子能科学研究院