An update on in situ cosmogenic 14C analysis at ETH Zurich

被引：29
|
作者：
Hippe, K. [1 ]
Kober, F. [2 ]
Wacker, L. [3 ]
Fahrni, S. M. [3 ,4 ]
Ivy-Ochs, S. [3 ]
Akcar, N. [5 ]
Schluechter, C. [5 ]
Wieler, R. [1 ]
机构：
[1] ETH, Inst Geochem & Petrol, CH-8092 Zurich, Switzerland
[2] ETH, Inst Geol, CH-8092 Zurich, Switzerland
[3] ETH, Inst Particle Phys, CH-8093 Zurich, Switzerland
[4] Univ Bern, Dept Chem & Biochem, CH-3012 Bern, Switzerland
[5] Univ Bern, Inst Geol Sci, CH-3012 Bern, Switzerland
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2013年 / 294卷
关键词：
In situ C-14; Cosmogenic nuclide; Data reduction; GLACIER; EROSION; MICADAS; COMPLEX; BE-10; RATES; RATIO;
D O I：
10.1016/j.nimb.2012.06.020
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
We present the improved performance of the modified in situ cosmogenic C-14 extraction system at ETH Zurich. Samples are now processed faster (2 days in total) and are measured with a high analytical precision of usually <2% using the gas ion source of the MICADAS AMS facility. Measurements of the PP-4 standard sample show a good reproducibility and consistency with published values. Procedural blanks are very low at currently similar to 4.0 x 10(4) C-14 atoms. Analyses of samples from a similar to 300 y old rock avalanche prove that we can successfully apply in situ C-14 exposure dating to very young surfaces. Additionally, we present a modified calculation scheme for in situ C-14 concentrations which differs from that used for conventional radiocarbon dating. This new approach explicitly accounts for the characteristics of in situ C-14 production. (C) 2012 Elsevier B.V. All rights reserved.
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页码：81 / 86
页数：6
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