@inproceedings{Rood:2013:10.1016/j.nimb.2012.08.039,
author = {Rood, DH and Brown, TA and Finkel, RC and Guilderson, TP},
doi = {10.1016/j.nimb.2012.08.039},
pages = {426--429},
title = {Poisson and non-Poisson uncertainty estimations of <sup>10</sup>Be/ <sup>9</sup>Be measurements at LLNL-CAMS},
url = {http://dx.doi.org/10.1016/j.nimb.2012.08.039},
year = {2013}
}

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TY  - CPAPER
AB  - We quantify the routine performance and uncertainties of 10Be measurements made on the CAMS FN accelerator mass spectrometer in combination with the CAMS high-intensity cesium sputter source. Our analysis compiles data from 554 primary and secondary standard targets measured on 47 different wheels in nine different run campaigns over a 1-year interval (September 2009-September 2010). The series includes 87, 86, and 85 measurements of each of three different secondary standards and 296 measurements of our primary standard, KNSTD3110 (01-5-4). The average initial 9Be3+ beam current is 22 ± 3 μA (1 standard deviation). Secondary standard targets, which are measured as unknowns in each of the wheels, have average statistical uncertainties based on counting statistics of 1.8%, 1.3%, and 0.8% (1σ) (September 2009-March 2010) and 1.3%, 1.0%, and 0.6% (April 2010-September 2010) for standard materials with 10Be/9Be = 5.35 × 10-13, 9.72 × 10-13, and 8.56 × 10 -12, respectively. The mean measured ratio for each of the secondary standards (normalized to the primary standard) falls within the 1.1% uncertainties of the reported values for each standard material. The weighted standard deviation around the mean of this large number of runs is 2.5%, 2.0%, and 1.2% (September 2009-March 2010) and 1.5%, 1.1%, and 1.2% (April 2010-September 2010) for each secondary standard. These data indicate an additional source of uncertainty, 0.9-1.8% (April 2010-September 2010) and 0.2-1.0% (April 2010-September 2010), above that calculated from counting statistics alone. These 10Be AMS results demonstrate the precision and accuracy of the LLNL-CAMS system. © 2012 Elsevier B.V. All rights reserved.
AU  - Rood,DH
AU  - Brown,TA
AU  - Finkel,RC
AU  - Guilderson,TP
DO  - 10.1016/j.nimb.2012.08.039
EP  - 429
PY  - 2013///
SN  - 0168-583X
SP  - 426
TI  - Poisson and non-Poisson uncertainty estimations of <sup>10</sup>Be/ <sup>9</sup>Be measurements at LLNL-CAMS
UR  - http://dx.doi.org/10.1016/j.nimb.2012.08.039
ER  - 

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