Accuracy of 9Be-data and its influence on 10Be cosmogenic nuclide data


Accuracy of 9Be-data and its influence on 10Be cosmogenic nuclide data

Merchel, S.; Bremser, W.; Bourlès, D. L.; Czeslik, U.; Erzinger, J.; Kummer, N.-A.; Leanni, L.; Merkel, B.; Recknagel, S.; Schaefer, U.

A 9Be-solution has been chemically prepared from phenakite (Be2SiO4) mineral grains as commercial 9Be-solutions are too high in long-lived 10Be. The solution is intended to be used as a carrier for radiochemical separation of 10Be to be measured by accelerator mass spectrometry (AMS). Thus, accurate data of the 9Be-concentration of this solution is essential to guarantee for high-accuracy 10Be data in the future. After devastating preliminary results (~8% standard deviation), eight laboratories finally produced twelve individual results by four different analytical methods. A certain lab and method bias might be identified by sophisticated statistical evaluation. Some laboratories also (grossly) underestimate their uncertainties. Thus, the simple weighted mean of this round-robin exercise needed to be corrected by introducing additional allowances (Paule-Mandel-approach). The final result has been calculated to (2246 ± 11) µg 9Be/(g solution) with a reasonably low weighted standard deviation of 0.49%. The maximum deviation of a single lab value from the weighted mean is 2.4% when removing one Grubbs outlier (11% off from the mean) from the data set. As 10Be-data, which is usually calculated from measured 10Be/9Be by AMS and stable 9Be, cannot be more accurate than the determined 9Be-concentration, it seems highly advisable to establish or improve quality assurance by having self-made carrier-solutions analysed at more than a single lab and regularly taking part in round-robin exercises.

Keywords: cosmogenic nuclide; ICP-MS; ICP-OES; AAS; round-robin; accelerator mass spectrometry; AMS

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Publ.-Id: 18614