title: Absolute standardization of 241Pu by the TDCR technique and effect of the beta spectral shape.
abstract: The NMISA participated in the 2010 international key comparison of (241)Pu, standardizing the inter-comparison solution by the TDCR efficiency calculation technique. Special attention was paid to ensure accurate efficiency calculation for this low-energy, pure beta-emitter: in particular the effect of low-energy stopping powers on the calculation of ionization quenching was assessed and an optimal value for the quench parameter, kB, was determined. In addition, phototube efficiency mismatch was accounted for by a software minimization technique. The effect of the beta spectral shape on the activity extracted from data analysis was assessed and found to be significant. Based on the results of this work we propose a new value for the average beta-particle energy.
authors.affiliation: National Metrology Institute of South Africa, 15 Lower Hope Road, Rosebank, 7700, Cape Town, South Africa. FvWyngaardt@nmisa.org
authors.forename: W M
authors.initials: WM
authors.lastname: van Wyngaardt
authors.forename: B R S
authors.initials: BR
authors.lastname: Simpson
authors.forename: M J
authors.initials: MJ
authors.lastname: van Staden
authors.forename: J
authors.initials: J
authors.lastname: Lubbe
mesh_terms: D000465:Algorithms; D002138:Calibration; D006207:Half-Life; D038622:Internationality; D011005:Plutonium / Q000032:analysis* / Q000592:standards*; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards*; D012015:Reference Standards; D012016:Reference Values
chemical_list: D011005:Plutonium