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

  • Weijian Zhou (a1) (a2) (a3), Shugang Wu (a1) (a4), Todd E Lange (a5), Xuefeng Lu (a1) (a2), Peng Cheng (a1) (a2), Xiaohu Xiong (a1) (a2) (a4), Richard J Cruz (a5), Qi Liu (a1) (a2) (a4), Yunchong Fu (a1) (a2) and Wennian Zhao (a2) (a3)...
Abstract

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.

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Copyright
Corresponding author
Corresponding author. Email: wcijian@locss.llqg.ac.cn.
References
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Jull, AJT, Donahue, DJ, Toolin, LJ. 1990. Discussion: recovery from tracer contamination in AMS sample preparation. Radiocarbon 32(1):84–5.
Vogel, JS, Southon, JR, Nelson, DE. 1990. Memory effects in an AMS system: catastrophe and recovery. Radiocarbon 32(1):81–3.
Zhou, W, Zhao, X, Lu, X, Liu, L, Wu, Z, Peng, C, Zhao, W, Huang, C. 2006. The 3MV multi-element AMS in Xi'an, China: unique features and preliminary tests. Radiocarbon 48(2):285–93.
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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