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Simple Pretreatment Method Development for Iron and Calcium Carbonate Samples

Published online by Cambridge University Press:  18 July 2016

Junghun Park ,
Wan Hong ,
H J Woo ,
Han Woo Choi ,
Joonkon Kim  and
Gi Dong Kim
Junghun Park*
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305–350, Korea
Wan Hong
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305–350, Korea
H J Woo
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305–350, Korea
Han Woo Choi
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305–350, Korea
Joonkon Kim
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305–350, Korea
Gi Dong Kim
Affiliation:
Korea Institute of Geoscience and Mineral Resources, 92 Gwahang-no, Yuseong-gu, Daejeon, 305–350, Korea
*
Corresponding author. Email: junghun@kigam.re.kr.
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Abstract

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Since iron artifacts generally contain trace amounts of carbon, an iron sample needs to be relatively large, as compared to other materials, and a specially designed combustion system is required. An elemental analyzer (EA) was used for the combustion of iron without any special chemical treatment. CO2 gas with 1 mg of carbon was obtained from the combustion of an iron artifact by using an EA and reduced to graphite for accelerator mass spectrometry (AMS) measurement. In this work, AMS dating results done at the Korea Institute of Geoscience and Mineral Resources (KIGAM) for several ancient iron artifacts are presented and compared with independently estimated ages. This method was found to be useful for the pretreatment of iron artifacts that contained >0.1% carbon. A simple pretreatment method using an EA was also applied to calcium carbonate (CaCO3) samples. Samples were preheated overnight at 100–300 °C, without any special chemical treatment. This removed modern CO2 contamination and the background level decreased to a comparable value measured in samples treated with phosphoric acid under vacuum.

Type
Sample Preparation
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1295 - 1300
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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