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| NKS Programme Area: | NKS-B | | Research Area: | Measurement Strategy, technology and QA | | Report Number: | NKS-436 | | Report Title: | Determination of important alpha emitters in nuclear and environmental samples –OptiMethod 2019 project report | | Activity Acronym: | OPTIMETHOD | | Authors: | Xiaolin Hou, Maria Anderot, Lina Ekerljung, Susanna Salminen-Paatero, Grzegorz Olszewski, Helene Öhlin, Maria Davidsson, Filippa Bruzell, Annika Tovedal, Satu Rautio, Stefan Allard, Antti Hatakka, Susanna Wijk, Mats Eriksson, Hanna Åberg, Erika Settervik, Tommy Suutari, Anna Vesterlund, Patric Lindahl, Satu Kangas, Petri Hovi, | | Abstract: | This report presents the achievement of the NKS-B OptiMethod 2019 project which was conducted in 2019. An intercomparison was organized on determination of important alpha emitters in two real samples collected from Swedish nuclear power plants, one is nuclear fuel pool water and another is aerosol filter sample. 10 Nordic labs participated in this exercise and reported the analytical results of isotopes of plutonium, americium, curium and 210Po. For the nuclear fuel pool water sample, the analytical results of 238Pu, 239, 240Pu, 241Am and 243, 244Cm reported by all participating labs agree with each other very well, and the performance of all participating labs is much better than in the intercomparison in 2018. Meanwhile the problems occurred in the intercomparison analysis of 2018, such as low chemical yield of Pu and Am/Cm, black residues in the prepared samples, and black and low quality of electrodeposition alpha source were not observed in the analysis in 2019. All these indicate a significantly improved quality of the radiochemical analysis of these radionuclides through this project. While, for the aerosol filter sample, the reported analytical results of alpha emitting radionuclides are lower than the detection limits of the method used in the partners’ lab, and a few reported data also vary largely, this is mainly attributed to the very low concentrations of target radionuclides in the aerosol filter and relatively small sample size for the analysis. The strategies for the analysis of alpha emitters in sample with very high 210Po content and the problem solution in the Nordic labs are also discussed in this report. | | Keywords: | Alpha emitter; Radioanalysis; reactor water; Inter-comparison; Plutonium; Americium; Curium | | Publication date: | 27 May 2020 | | ISBN: | ISBN 978-87-7893-526-7 | | Number of downloads: | 1501 | | Download: |  NKS-436.pdf |
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