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Capabilities of the new SUERC 5MV AMS facility for (super 14) C dating.

S Xu, R Anderson, C Bryant, G T Cook, A Dougans, S Freeman, P Naysmith, C Schnabel, E M Scott

Abstract


A new National Electrostatic Corporation (NEC) 5MV accelerator mass spectrometer became operational at the Scottish Universities Environmental Research Centre (SUERC) in July 2002. It has 2 Cs sputter negative ion sources: a 134-sample source (S1) for the routine measurement of all species, and a hybrid source (S2) with 40 spaces for radiocarbon measurements with either graphite or CO (sub 2) samples. A number of performance tests on graphite samples have been carried out on both sources. A precision of better than 0.3% is feasible for modern samples on a routine basis. The (super 14) C background of the machine and the graphite preparation process blank are 0.04+ or -0.01 and 0.16+ or -0.05 pMC, respectively, indicating that (super 14) C dating back to approximately 50 kyr BP is possible. The normalized (super 14) C values for a series of reference materials agree well with the IAEA, TIRI, and FIRI consensus values. Routine measurement of (super 14) C has been underway since May 2003. Preliminary results of performance tests on the CO (sub 2) gas ion source are also reported.

Keywords


absolute age;accelerator mass spectroscopy;accuracy ;Al 26;alkaline earth metals;aluminum ;Be 10;beryllium ;C 14;carbon ;carbon dioxide;Cenozoic ;chlorine ;Cl 36;Europe ;graphite ;Great Britain;halogens ;Holocene ;I 129;instruments ;iodine ;ions ;isotopes ;mass spectroscopy;measurement ;metals ;methods ;native elements;Quaternary ;radioactive isotopes;Scotland ;Scottish Universities Environmental Research Centre;spectroscopy ;United Kingdom;Western Europe

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