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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