Study of 10Be/7Be analysis method using Accelerator Mass Spectrometry
Dr Yun-Chong Fu1,2,3, Dr Li Zhang1,2, Prof. Wei-Jian Zhou1,2,3, Mr Guo-Qing Zhao1,2, Mr Xu-Ke Liu1,2,4
1Institute Of Earth Environment, Chinese Academy Of Sciences, Xi’an, China, 2Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi’an, China, 3Xi’an Jiaotong University, Xi’an, China, 4University of Chinese Academy of Sciences, Beijing, China
The 10Be/7Be ratio is a sensitive tracer for the study of atmospheric transport, particularly with regard to stratosphere-troposphere exchange. Measurements with high accuracy and efficiency are crucial to 7Be and 10Be tracer studies. Full stripping method of 7Be have been carried out by few larger AMS. However, for low energy AMS that is difficult to obtain efficient full stripping Be, the method of 7Be measurement using non-fully stripping is few reports, which is more widely applicable for all AMS. Firstly, the preparation procedures of rain samples that is suitable for 7Be and 10Be by AMS measurement at same target have been established. 7Be analysis has been performed to by full stripping method, which completely removed 7Li due to its electronic structure, using more homogeneous Si3N4 as a secondary stripping film, and same way for 10Be. 7Be/9Be background was less than 2×10-16. On the other hand, study for non-full stripping method to 7Be has been analyzed by AMS. The magnitude of suppression for isobaric 7Li has been discussed at each stage, and another interference 14N were found and analyzed. Due to the full stripping method was not used, it makes for it possible to analyze 7Be with lower energy AMS, which is ultra-low efficiency to obtain 7Be4+. The non-full stripping method is generally method for 7Be analysis especially for low energy AMS. In addition, we discussed quality control and data calibration methods. A preliminary study of environment applied was carried out using 7Be and 10Be by 3MV AMS. The ratio of 10Be/7Be and concentration of 10Be and 7Be of rainwater collected in Xi’an have been obtained.
Dr. Fu Yun-Chong is a Physicist with 15 years’ experience in nuclear technology and its applications. Fu Yun-Chong started working at Xi’an AMS Center of IEECAS in 2009. Since then, Dr. Fu is focus on Accelerator Mass Spectrometry technology and its applications. In now, Dr Fu is technical director of Xi’an-AMS. Dr. Fu’s contributions to Xi’an-AMS were in the development of new ability for extra nuclides (7Be,41Ca, 99Te,236U), to set up gas negative ion source, to employs super-halogen anion with AMS, and to provide high-precision measurements of 10Be,14C,26Al etc. samples.