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Small-mass graphite preparation for AMS 14C measurements performed at GIGCAS, China

  • P Ding (a1), C D Shen (a1) (a2), W X Yi (a1), N Wang (a1) and X F Ding (a2)...

The sealed tube Zn reduction method has been applied for small-mass samples ranging from 15 to 100 μg carbon preparation for accelerator mass spectrometry (AMS) radiocarbon (14C) measurements at the AMS-14C Preparation Lab in Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). The volume of the sealed reactor tube is reduced to ~0.75 cm3 in order to increase the yield of graphite. Graphite targets are measured at the Keck Carbon Cycle AMS Facility at the University of California, Irvine (KCCAMS). The targets generate a maximum 12C+1 current of about 0.5 μA per 1 μg C. The modern-carbon background is estimated to be 0.25–0.60 μg C, and dead-carbon background to be ~0.3–0.9 μg C. Both modern-carbon background and dead-carbon background are size dependent, so the results can be corrected. The precision of the small-mass modern carbon standard samples is±15–25‰ for the size of ~15–20 μg C,±5–10‰ for ~20–50 μg C, and±3–10‰ for 50–100 μg C. Further reduction of dead-carbon and modern-carbon contamination is needed in preparation of small-mass samples at GIGCAS.

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Selected Papers from the 2015 Radiocarbon Conference, Dakar, Senegal, 16–20 November 2015

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Ding P, Shen CD, Yi WX, Wang N, Ding XF, Liu KX, Fu DP, Liu WG, Liu Y. 2015. A high-resolution method for 14C analysis of a coral from South China Sea: implication for “AD 775” 14C event. Nuclear Instruments and Methods in Physics Research B 361:659664.
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Liu JW, Li J, Zhang YL, Liu D, Ding P, Shen CD, Shen KJ, He QF, Ding X, Wang XM, Chen DH, Szidat S, Zhang G. 2014. Source apportionment using radiocarbon and organic tracers for PM2.5 carbonaceous aerosols in Guangzhou, South China: contrasting local- and regional-scale haze events. Environment Science & Technology 48(20):1200212011.
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Xu X, Gao P, Salamanca EG. 2013. Ultra small-mass graphitization by sealed tube zinc reduction method for AMS 14C measurements. Radiocarbon 55(2–3):608616.
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  • ISSN: 0033-8222
  • EISSN: 1945-5755
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