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An inter-comparison of 10Be and 26Al AMS reference standards and the 10Be half-life by David Fink; Andrew Smith is a Engineering article available to read on EtoBox.

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We have completed a survey and inter-comparison of several 10 Be and 26 Al standard reference materials (SRMs) that are in routine use at various AMS laboratories to assess their relative values and the accuracy of their quoted nominal ratios. The accelerator measurement cycle, analysis procedure and setup used at the ANTARES AMS facility for this survey are described. We focused on a new set of 10 Be and 26 Al serial dilutions of standard reference materials (SRMs) prepared by Kuni Nishiizumii at the University of California, Berkeley, and found excellent systematic reproducibility and internal consistency. For other standard materials, minor deviations are evident even when the results have been recalibrated to a common half-life. In particular, we confirm that the NIST 10 Be SRM-4325 has a 14% greater 10 Be/Be ratio than that certified by NIST when it is calibrated against other SRMs whose ratios have been normalized to a common 1.5 Ma 10 Be half-life. In order to investigate this apparent discrepancy, we report on the results of an absolute, normalization independent, measure of the NIST-4325 10 Be/Be ratio. Within the constraints of this type of measurement and its systematic

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Author

David Fink; Andrew Smith

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0168-583X)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)