Speaker
Description
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 a blank field, 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.
| Student Submission | No |
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