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High-Level 14C Contamination and Recovery at Xi'an AMS Center

Published online by Cambridge University Press:  18 July 2016

Weijian Zhou ,
Shugang Wu ,
Todd E Lange ,
Xuefeng Lu ,
Peng Cheng ,
Xiaohu Xiong ,
Richard J Cruz ,
Qi Liu ,
Yunchong Fu  and
Wennian Zhao
Weijian Zhou*
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China Xi'an Jiaotong University, Xi'an 710049, China
Shugang Wu
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Todd E Lange
Affiliation:
NSF-Arizona AMS Facility, Physics Department, Building #81, University of Arizona, Tucson, Arizona 85721, USA
Xuefeng Lu
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China
Peng Cheng
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China
Xiaohu Xiong
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Richard J Cruz
Affiliation:
NSF-Arizona AMS Facility, Physics Department, Building #81, University of Arizona, Tucson, Arizona 85721, USA
Qi Liu
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Yunchong Fu
Affiliation:
State Key Lab Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China
Wennian Zhao
Affiliation:
Shaanxi Province Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Institute of Earth Environment, CAS, Xi'an 710043, China Xi'an Jiaotong University, Xi'an 710049, China
*
Corresponding author. Email: wcijian@locss.llqg.ac.cn.
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Abstract

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A sample with a radiocarbon concentration estimated to be greater than 105 times Modern was inadvertently graphitized and measured in the Xi'an AMS system last year. Both the sample preparation lines and the ion source system were seriously contaminated and a series of cleaning procedures were carried out to remove the contamination from them. After repeated and careful cleaning as well as continuous flushing with dead CO2 gas, both systems have recovered from the contamination event. The machine background is back to 2.0 x 10–16 and the chemical blank is beyond 50 kyr.

Type
Articles
Information
Radiocarbon , Volume 54 , Issue 2 , 2012 , pp. 187 - 193
Copyright
Copyright © 2012 by the Arizona Board of Regents on behalf of the University of Arizona 

References

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