An approach for optimizing in situ cosmogenic 10Be sample preparation

被引:138
作者
Corbett, Lee B. [1 ]
Bierman, Paul R. [1 ]
Rood, Dylan H. [2 ,3 ]
机构
[1] Univ Vermont, Sch Environm & Nat Resources, Dept Geol & Rubenstein, Burlington, VT 05405 USA
[2] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, South Kensington Campus, London SW7 2AZ, England
[3] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA
基金
美国国家科学基金会;
关键词
Geomorphology; Earth surface process; Geochronology; Cosmogenic nuclides; Sample preparation; ACCELERATOR MASS-SPECTROMETRY; PRODUCTION-RATE CALIBRATION; SURFACE EXPOSURE AGES; EROSION RATES; HALF-LIFE; AL-26; NUCLIDES; SEDIMENT; BURIAL; QUARTZ;
D O I
10.1016/j.quageo.2016.02.001
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Optimizing sample preparation for the isotopic measurement of Be-10 extracted from quartz mineral separates has a direct positive effect on the accuracy and precision of isotopic analysis. Here, we demonstrate the value of tracing Be throughout the extraction process (both after dissolution and after processing), producing pure Be (by optimizing ion exchange chromatography methods and quantifying quartz mineral separate and final Be fraction purity), and minimizing backgrounds (through reducing both laboratory process blanks and B-10 isobaric interference). These optimization strategies increase the amount of Be-10 available for analysis during accelerator mass spectrometry (AMS), while simultaneously decreasing interference and contamination, and ensuring that sample performance matches standard performance during analysis. After optimization of our laboratory's extraction methodology, Be-9(3+) ion beam currents measured during AMS analysis, a metric for sample purity and Be yield through the extraction process, matched the Be-9(3+) beam currents of AMS standards analyzed at the same time considering nearly 800 samples. Optimization of laboratory procedures leads to purer samples that perform better, more consistently, and more similarly to standards during AMS analysis, allowing for improved precision and accuracy of measurements used for dating and quantification of Earth surface processes. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:24 / 34
页数:11
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