caa a22 4500 469110546 CHVBK 20180323133109.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02034796 doi (NATIONALLICENCE)springer-10.1007/BF02034796 Determination of241Pu by low level β-proportional counting. Application to Chernobyl fallout samples and comparison with the241Am build-up method [Elektronische Daten] [G. Rosner, H. Hötzl, R. Winkler] A chemical separation procedure is described which allows the direct determination of low241Pu activities in environmental samples with a windowless gas-flow proportional counter. While current separation schemes based on anion exchange yield counting sources of sufficient purity for subsequent α-spectrometry, for β-counting of241Pu additional purification steps are required. A combination of anion exchange from 9 mol/l HCl, LaF3 precipitation and TTA extraction was found to be suitable even for the analysis of long-range Chernobyl fallout samples which contained interfering radionuclides with β-activities at least 3 to 4 orders of magnitude higher than usually encountered. No difference is detectable between the results of the present, direct procedure and the results of the conventional indirect method based on the build-up of241Am. Average241Pu/239+240Pu ratios in air and deposition samples taken at Neuherberg near Munich were 70±6 with the present procedure and 66±9 from241Am build-up. Akadémiai Kiadó, 1992 Rosner G. GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, D-8042, Neuherberg, Germany aut Hötzl H. GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, D-8042, Neuherberg, Germany aut Winkler R. GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, D-8042, Neuherberg, Germany aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 163/2(1992-12-01), 225-233 0236-5731 163:2<225 1992 163 10967 https://doi.org/10.1007/BF02034796 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02034796 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rosner G. GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, D-8042, Neuherberg, Germany aut NATIONALLICENCE 700 1- Hötzl H. GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, D-8042, Neuherberg, Germany aut NATIONALLICENCE 700 1- Winkler R. GSF-Forschungszentrum für Umwelt und Gesundheit, Institut für Strahlenschutz, D-8042, Neuherberg, Germany aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 163/2(1992-12-01), 225-233 0236-5731 163:2<225 1992 163 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer