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1 results

  • A Preliminary ion Source Background Study at Lalonde AMS

  • X-L Zhao, C A Crann, S Murseli, G St-Jean, W E Kieser, M Wilk, R J Cornett, I D Clark
  • Journal:
    Radiocarbon / Volume 61 / Issue 4 / August 2019
    Published online by Cambridge University Press:
    06 June 2019, pp. 1091-1106
    Print publication:
    August 2019
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  • Observation of the ion source generated background has been an area of focus during our routine analytical work. It is noted that the results of very-low-ratio samples are dependent upon the particular procedures for measurement using the present-day Cs+ sputter ion sources. When measured without excessive Cs+ fluxes and without interleafing with other higher-ratio samples and references, the accelerator mass spectrometry (AMS) sensitivity can be somewhat improved. In some cases, it appears possible to assess old radiocarbon (14C) samples to beyond the long-standing 60 kyr limit. A number of observational studies are made for the sole purpose of minimizing the final contamination to the rare isotopes that is generated within the ion source.