Results of an international comparison of activity measurements of <sup>68</sup>Ge.

Details

Serval ID
serval:BIB_2CBD8917F105
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Results of an international comparison of activity measurements of <sup>68</sup>Ge.
Journal
Applied radiation and isotopes
Author(s)
Cessna J.T., Fitzgerald R., Zimmerman B.E., Laureano-Pérez L., Bergeron D.E., van Wyngaardt F., Smith M., Jackson T., Howe B., da Silva C.J., Iwahara A., da Cruz PAL, Zhang M., Liu H., Liang J., Fréchou C., Bobin C., Cassette P., Kossert K., Nähle O., Marganiec-Gałązka J., Joseph L., Ravindra A., Kulkarni D.N., Yunoki A., Sato Y., Lee K.B., Lee J.M., Dziel T., Listkowska A., Tymiński Z., Sahagia M., Antohe A., Ioan M.R., Luca A., Krivosek M., Ometakova J., Javornik A., Zalesakova M., García-Toraño Martinez E., Roteta M., Mejuto M., Nedjadi Y., Juget F., Yuan M.C., Yeh C.Y., Yeltepe E., Dirican A., Keightley J., Pearce A.
Working group(s)
Agung
ISSN
1872-9800 (Electronic)
ISSN-L
0969-8043
Publication state
Published
Issued date
04/2018
Peer-reviewed
Oui
Volume
134
Pages
385-390
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
An international key comparison, identifier CCRI(II)-K2.Ge-68, has been performed. The National Institute of Standards and Technology (NIST) served as the pilot laboratory, distributing aliquots of a <sup>68</sup> Ge/ <sup>68</sup> Ga solution. Results for the activity concentration, C <sub>A</sub> , of <sup>68</sup> Ge at a reference date of 12h00 UTC 14 November 2014 were submitted by 17 laboratories, encompassing many variants of coincidence methods and liquid-scintillation counting methods. The first use of 4π(Cherenkov)β-γ coincidence and anticoincidence methods in an international comparison is reported. One participant reported results by secondary methods only. Two results, both utilizing pure liquid-scintillation methods, were identified as outliers. Evaluation using the Power-Moderated Mean method results in a proposed Comparison Reference Value (CRV) of 621.7(11)kBqg <sup>-1</sup> , based on 14 results. The degrees of equivalence and their associated uncertainties are evaluated for each participant. Several participants submitted 3.6mL ampoules to the BIPM to link the comparison to the International Reference System (SIR) which may lead to the evaluation of a Key Comparison Reference Value and associated degrees of equivalence.

Keywords
Equivalence, Gallium-68, Germanium-68, International comparison
Pubmed
Web of science
Create date
10/01/2018 10:52
Last modification date
20/08/2019 13:11
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