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Results of participation in the international intercomparison study for biogenic component in liquid fuels

Krajcar Bronić, Ines; Kožar Logar, Jasmina; Krištof, Romana; Nikolov, Jovana; Todorović, Nataša; Stojković, Ivana; Barešić, Jadranka; Sironić, Andreja; Borković, Damir (2019) Results of participation in the international intercomparison study for biogenic component in liquid fuels. In: Popić, Jelena; Coha, Ivana; Krajcar Bronić, Ines; Knežević Medija, Željka, (eds.) Zbornik radova Dvanaestog simpozija Hrvatskog društva za zaštitu od zračenja. Zagreb, Hrvatsko društvo za zaštitu od zračenja, pp. 355-362 .

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Direct method by measurement 14C activity of liquid fuel samples in liquid scintillation counter (the „direct LSC method“) has been recognized as a powerful and reliable method of determination of biogenic component in liquid fuels (fbio). Laboratories of the Ruđer Bošković Institute (RBI) in Zagreb, Croatia, the Jožef Stefan Institute (JSI) in Ljubljana, Slovenia, and at the Faculty of Science of the University of Novi Sad (UNS), in Novi Sad, Serbia, have been implemented and optimized slightly different methods. The 3 laboratories participated in the international intercomparison study ILC/2018 „Content of biocomponent in liquid fuel samples“, which was organized in 2018 by the Institute of Ceramics and Building Materials (Opole, Poland). Here we present the fbio results obtained by these 3 laboratories and compare the results with the expected fbio-exp values since at the moment of preparing this work the official results of the study have not been available. Laboratories obtained 7 samples of different colours and only the basic composition (diesel type of fuel) was known. The results for samples with the SQP(E) values well above the limits of applicability of the direct LSC method were satisfying in all three laboratories. Qualitatively acceptable, but quantitatively unacceptable results, were obtained for a sample in the SQP(E) region of limited applicability. For one of the samples the quenching was high, and the quenching parameter SQP(E) was below the limits of applicability of the direct LSC method in all 3 laboratories. The obtained results will be used for further validation and optimization of the developed direct LSC methods, especially for reconsidering the uncertainty budget and the background level. Although there are some differences in details of the applied direct LSC methods in the laboratories of RBI, JSI and UNS, the presented intercomparison results show that all the methods are suitable for determination of the fbio in liquid fuels, providing the correctly defined limits of applicability for highly quenched samples. Laboratories that have possibility of applying a different 14C measurement technique can satisfactorily determine fbio also in highly quenched samples, but these techniques are more complicated and more expensive.

Item Type: Conference or workshop item published in conference proceedings (UNSPECIFIED)
Uncontrolled Keywords: 14C; liquid fuels; biogenic fraction; intercomparison
Subjects: NATURAL SCIENCES > Interdisciplinary Natural Sciences
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Radiation Science
Divisions: Division of Experimental Physics
Depositing User: Ines Krajcar Bronić
Date Deposited: 23 Apr 2019 10:44

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