%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Merchel, S.
%A Bremser, W.
%A Bourles, D. L.
%A Czeslik, U.
%A Erzinger, J.
%A Kummer, N. A.
%A Leanni, Laetitia
%A Merkel, B.
%A Recknagel, S.
%A Schaefer, U.
%T Accuracy of Be-9-data and its influence on Be-10 cosmogenic nuclide data
%D 2013
%L fdi:010061327
%G ENG
%J Journal of Radioanalytical and Nuclear Chemistry
%@ 0236-5731
%K Cosmogenic nuclide ; ICP-MS ; ICP-OES ; AAS ; Round-robin ; Accelerator mass spectrometry
%M ISI:000327248400051
%N 3
%P 1871-1878
%R 10.1007/s10967-013-2746-x
%U https://www.documentation.ird.fr/hor/fdi:010061327
%> https://www.documentation.ird.fr/intranet/publi/2013/12/010061327.pdf
%V 298
%W Horizon (IRD)
%X A Be-9-solution has been chemically prepared from phenakite (Be2SiO4) mineral grains as commercial Be-9-solutions are too high in long-lived Be-10. The solution is intended to be used as a carrier for radiochemical separation of Be-10 to be measured by accelerator mass spectrometry (AMS). Thus, accurate data of the Be-9-concentration of this solution is essential to guarantee for high-accuracy Be-10 data in the future. After devastating preliminary results (similar to 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 (2,246 +/- A 11) mu g Be-9/(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 Be-10-data, which is usually calculated from measured Be-10/Be-9 by AMS and stable Be-9, cannot be more accurate than the determined Be-9-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.
%$ 060 ; 020