1. Results of an international comparison of activity measurements of $^{68}$Ge
- Author
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Emin Yeltepe, Leena Joseph, C.J. da Silva, A. Javornik, P.A.L. da Cruz, J. Ometakova, M. Krivosek, John Keightley, M. Zalesakova, J.M. Lee, Jeffrey T. Cessna, M.-C. Yuan, Y. Nedjadi, M. Mejuto, M. Zhang, Timothy Jackson, Lizbeth Laureano-Perez, F. van Wyngaardt, J. Liang, Abdullah Dirican, A.K. Pearce, K.B. Lee, M.-R. Ioan, M. Sahagia, C. Bobin, Ole Nähle, T. Dziel, C.Y. Yeh, Karsten Kossert, C. Fréchou, A. Listkowska, E. García-Toraño Martinez, D.N. Kulkarni, Yasushi Sato, A. Antohe, Justyna Marganiec-Gałązka, A. Iwahara, H. Liu, Ryan P. Fitzgerald, A. Luca, Brian E. Zimmerman, M. Roteta, Z. Tymiński, Akira Yunoki, M.L. Smith, P. Cassette, F. Juget, Anuradha Ravindra, Agung, Denis E. Bergeron, B. Howe, National Institute of Standards and Technology [Gaithersburg] (NIST), Australian Nuclear Science and Technology Organisation [Australie] (ANSTO), Laboratório Nacional de Metrologia das Radiações Ionizantes, Instituto de Radioproteção e Dosimetria, National Institute of Metrology [Beijing], Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physikalisch-Technische Bundesanstalt [Braunschweig] (PTB), Bhabha Atomic Research Centre (BARC), Government of India, Department of Atomic Energy, National Institute of Advanced Industrial Science and Technology (AIST), Korea Research Institute of Standards and Science [Daejon] (KRISS), KRISS, National Centre for Nuclear Research Radioisotope, Centre POLATOM, Horia Hulubei National Institute for Physics and Nuclear Engineering, Slovenský Metrologický Ústav, Centro de Investigaciones Energéticas Medioambientales y Tecnológicas [Madrid] (CIEMAT), Institut Universitaire de Radiophysique Appliquée, Institute of Nuclear Energy Research, Turkish Atomic Energy Authority, National Physical Laboratory [Teddington] (NPL), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
- Subjects
Germanium-68 ,Nuclear instrumentation ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,010403 inorganic & nuclear chemistry ,Metrology ,01 natural sciences ,Equivalence ,Coincidence ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Statistics ,Activity concentration ,CALIBRATION METHODOLOGY ,Equivalence (measure theory) ,International comparison ,Mathematics ,instrumentation ,Radiation ,Gallium-68 ,Primary activity measurement ,STANDARDIZATION ,calibration ,0104 chemical sciences ,Activity measurements ,radioactivity ,NIST ,Reference material ,ionizing radiation - Abstract
Proceedings of the 21st International Conference on Radionuclide Metrology and its Applications (ICRM), May 15-19, 2017, Buenos Aires, Argentina. Organizer: Argentinian National Atomic Energy Commission; International audience; 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 $^{68}$Ge/$^{68}$Ga solution. Results for the activity concentration, CA, of $^{68}$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) kBq g$^{−1}$, based on 14 results. The degrees of equivalence and their associated uncertainties are evaluated for each participant. Several participants submitted 3.6 mL 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.
- Published
- 2018