Standardization of Tc-99 by three liquid scintillation counting methods.

Autor: van Wyngaardt WM; National Metrology Institute of South Africa, 15 Lower Hope Road, Rosebank, 7700 Cape Town, South Africa. Electronic address: radioactivity@nmisa.org., van Staden MJ; National Metrology Institute of South Africa, 15 Lower Hope Road, Rosebank, 7700 Cape Town, South Africa., Lubbe J; National Metrology Institute of South Africa, 15 Lower Hope Road, Rosebank, 7700 Cape Town, South Africa., Simpson BR; National Metrology Institute of South Africa, 15 Lower Hope Road, Rosebank, 7700 Cape Town, South Africa.
Jazyk: angličtina
Zdroj: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine [Appl Radiat Isot] 2014 May; Vol. 87, pp. 254-9. Date of Electronic Publication: 2013 Nov 25.
DOI: 10.1016/j.apradiso.2013.11.032
Abstrakt: The NMISA participated in the international key comparison of the pure beta-emitter Technetium-99, CCRI(II)-K2.Tc-99. The comparison solution was standardized using three methods, namely the TDCR efficiency calculation method, the CIEMAT/NIST efficiency tracing method and the 4π(LS)β-γ coincidence tracing method with Co-60 as tracer. Excellent agreement between results obtained with the three methods confirmed the applicability of the beta spectral shape given by the latest (2011) DDEP evaluation of Tc-99 decay data, rather than the earlier (2004) evaluation.
(© 2013 Published by Elsevier Ltd.)
Databáze: MEDLINE
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