岩矿测试2012，Vol.31Issue(1)：83-89,7.
暴露测年样品中26Al和10Be分离及其加速器质谱测定
The Extraction of in-situ 10 Be and 26Al from Rock Sample and Accelerator Mass Spectrometric Measurements
摘要
Abstract
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 l0Be and 26A1 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 HC1 to elute Al. The results of AcceleratorMass Spectrometry (AMS) show that the average for Be/ Be and 26Al/27 Al 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.关键词
原地宇宙成因核素/10Be/26Al/暴露测年/加速器质谱Key words
in-situ cosmogenic nuclide/ 10Be/ 26A1/ exposure dating/ accelerator mass spectrometry分类
化学化工引用本文复制引用
张丽,周卫健,常宏,赵国庆,宋少华,武振坤..暴露测年样品中26Al和10Be分离及其加速器质谱测定[J].岩矿测试,2012,31(1):83-89,7.基金项目
国家重点基础研究发展计划(973计划)项目(2010CB833400) （973计划）
国家自然科学基金项目(41023006) （41023006）
