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The extraction of in-situ 10Be and 26Al from rock sample and accelerator mass spectrometric measurements
|Authors:||Zhang Li; Zhou Weijian; Chang Hong; Zhao Guoqing; Song Shaohua; Wu Zhenkun|
|Author Affiliations:||Primary: |
Chinese Academy of Sciences, Institute of Earth Environment, Xi'an, China
|Volume Title:||Yankuang Ceshi Rock and Mineral Analysis|
|Source:||Yankuang Ceshi = Rock and Mineral Analysis, 31(1), p.83-89. Publisher: Dizhi Chubanshe, Beijing, China. ISSN: 0254-5357|
|Note:||In Chinese with English summary. 32 refs.; illus., incl. 4 tables|
|Summary:||With the development of accelerator mass spectrometry, a variety of long-lived cosmogenic nuclides, especially the in-situ cosmogenic nuclides 10Be and 26Al, are increasingly applied to earth sciences. Based on published procedures, a modified procedure for 10Be and 26Al exposure dating has been developed, which includes 10Be and 26Al extraction, anion exchange column separation, purification and target preparation. In this procedure, NCS 9Be was chosen instead of Merck and Fluka as the carrier for the 10Be sample, with a small amount of ion exchange resin instead of a large one. In particular, the elution curve for an anion exchange column procedure by Purdue University was modified as 0.05 mol/L H2C2O4-0.75 mol/L HCl to elute Al. The results of Accelerator Mass Spectrometry (AMS) show that the average for 10Be/9Be and 26Al/27Al of thirteen chemical blanks were 7.48×10-15 and 1.96×10-15, respectively, as low as those of other AMS laboratories. The ICP-AES results indicated the recoveries of Be and Al were 90% and 60%, respectively. One sample from Jinfosi Site, North of Qilian Shan Mountain, was tested based on this new procedure. The dating results of (10.7±1.0) ka for 10Be and (10.0±1.2) ka for 26Al, were consistent with published geological results.|
|Subjects:||Accelerator mass spectroscopy; Al-26; Alkaline earth metals; Aluminum; Be-10; Beryllium; Chemical analysis; Geochemistry; In situ; Isotopes; Mass spectroscopy; Metals; Methods; Radioactive isotopes; Rocks; Sample preparation; Samples; Spectroscopy|
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