Optimization of sample preparation method for 10Be AMS measurement

Dr Chaolu Yi, Dr Xingfang Ding, Professor Feng Xian, Professor Kejun Dong, Dr Yunzhong Fu, Professor Kexin Liu

Higher Beam currents are expected during 10Be/9Be measurements by accelerated mass spectrometry. The last two steps for Be sample preparation include the burning of Be(OH)2 to obtain BeO and then niobium power is added and mixed with the BeO to increase ion beam current. However, the burnt BeO is flaky and a little bit hard to be ground to power so that they cannot mixed evenly. In this study, we present a method of sample preparation which would increase beam current for Be measurement so as to decrease the measurement errors. After Be(OH)2 gel was prepared, we added a little bit niobium powder into the gel and mixed them evenly. After burning in a muffle furnace, Niobium was oxidized into Nb2O5, and Be(OH)2 was dehydrated into BeO. They eventually became a fluffy, evenly white powder. Finally a little bit niobium was added into the white powder. The results of 10Be measurements show that the average of beam currents extracted from BeO mixed with both niobium powder and Nb2O5 were 2.5~4.6 times higher than those mixed only with niobium powder or with Nb2O5. These indicate that the mechanism for high beam current is the homogeneousness of BeO produced by expanded Nb2O5 powder.

The content of the abstract mainly comes from a Chinese patent, A method to increase beam current for Be measurement. Series: 201910175697.9. Authority date:2021-6-30. Inventor: Chaolu Yi.


Biography:

08/2020 – Employer, Zhijiu Elec-nuclide dating Science and Technology Co. Limited, Suzhou
06/2004 -07/2020: Professor, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing
03/2002 – 05/2004: Professor, Nanjing University, Nanjing
08/92 – 03/2002: Research fellow, Associate Professor, Professor, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan.
1988.9-1992.7: Ph.D., Geomorphology and Quaternary geology, Peking University, Beijing
01/1985 – 08/1988: Research fellow, Hydrobiology Institute, Chinese Academy of Sciences, Wuhan,
1982.3-1984.12: B.Sc., M.Sc., Central China Normal University, Wuhan

Focus on 1)techniques of dating; 2)Geomorphology and chronology in cosmogenic nuclide and electron spin resonance dating

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Date

Nov 08 - 19 2021