Interlaboratory consensus building challenge
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ANALYTICAL CHALLENGE
Interlaboratory consensus building challenge Antonio Possolo1 Published online: 5 March 2020 © This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2020
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1. deriving a consensus value from these results; 2. evaluating the associated standard uncertainty; 3. producing a coverage interval that, with 95 % confidence, is believed to include the true value of which the consensus value is an estimate; 4. suggesting how the measurement result from NIST may be compared with the consensus value.
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Figure 1 depicts measurement results for the activity of iron-59 from an interlaboratory comparison which started in 1976 and has involved many national metrology institutes [3]. These are measurements of equivalent activity made using the International Reference System (Syst`eme International de R´ef´erence, SIR) that is maintained at the International Bureau of Weights And Measures (BIPM) [4]. This measurement system compares the activity of iron-59 in a solution submitted by a participant with the activity of several well-characterized radium-226 reference sources. The equivalent activity, Ae (59 Fe), is defined as that activity which will produce an electrical current in the ionization chamber equal to the current produced by the radium reference source of the highest activity.
Interlaboratory comparisons form an essential part of metrology and they are organized to assess the ability of laboratories to provide accurate measurement results. For this, one needs to compute a single consensus value that represents a collective estimate of the quantity being measured. The challenge before us comprises four tasks:
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Meet the challenge
The challenge
A e(59Fe)
We would like to invite you to participate in the Analytical Challenge, a series of puzzles to entertain and challenge our readers. This special feature of “Analytical and Bioanalytical Chemistry” has established itself as a truly unique quiz series, with a new scientific puzzle published every three months. Readers can access the complete collection of published problems with their solutions on the ABC homepage at http://www.springer.com/abc. Test your knowledge and tease your wits in diverse areas of analytical and bioanalytical chemistry by viewing this collection. In the present challenge, interlaboratory comparisons is the topic. And please note that there is a prize to be won (a Springer book of your choice up to a value of e100). Please read on...
Antonio Possolo
[email protected] 1
National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899-8980, USA
IAEA/RCC NIST ANSTO LNE−LNHB BARC BKFH PTB NPL CMI−IIR NMIJ KRISS
Fig. 1 Selected measured values for the activity of iron-59 obtained in key comparison BIPM.RI(II)-K1.Fe-59 [3]. The red diamonds represent the most recent result produced by each participant and vertical blue lines represent the associated standard uncertainties
Antonio Posso
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