| Zugriffsnummer | 25367 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Beta shape-factor function and activity determination of 241Pu |
| Autor(in); Institution |
Kossert, Karsten; 6.1, Radioaktivität, PTB-Braunschweig
Nähle, Ole Jens; 6.1, Radioaktivität, PTB-Braunschweig
Grau Carles, A.; Instituto de Física Fundamental (CSIC), Madrid, SPAIN
|
| Quelle/Jahr | Applied Radiation and Isotopes: 69 (2011), 9, 1246 - 1250 |
| ISSN | 0969-8043 |
| DOI | |
| URL | |
| Verlag | Amsterdam: Elsevier |
| Konferenzangaben | LSC 2010, Advances in Liquid Scintillation Spectrometry Conference, Paris, 06-10, September 2010, France |
| Freie Schlagworte | Liquid scintillation counting ; CIEMAT/NIST method ; TDCR ; 241Pu ; Beta spectrum ; Shape-factor function |
| Zusammenfassung | The Physikalisch-Technische Bundesanstalt (PTB) investigated the low-energy beta emitter. Sup.241Pu within the scope of an international key comparison on the activity concentration of the same solution. The activity concentration was measured by means of liquid scintillation counters with two and three photomultiplier tubes (PMT). The counting efficiencies were determined wit htwo established techniques, which are based on a free parameter model. The free parameter is determined via 3H-efficiency tracing in systems with two PMT’s, or it is derived from the triple-to-double coincidence ratio (TDCR) in a system with tree PMT’s. Both methods require an accurate computation of the beta emission spectrum of the first-forbidden (non-unique) transition. In this work, the experimental outcome of a recent measurement from the Liodl et al. (2010) with cryogenic magnetic calorimeters was used to determine a shape-factor function C(W) = 1 – 1.9582 W 2 and an end-point energy Eβ,max = 21.6 keV are used. The activity concentrations determined with the two methods agree well when using the new shape-factor function, whereas a considerable discrepancy is found when assuming .ital.C(W) = 1, as for an allowed beta transition. Consequently, the difference between the efficiency tracing method and the TDCR method, as observed by other researchers, could be resolved. |
