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Publication Citation: A New Primary Standardization of Th-229

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Author(s): Ryan P. Fitzgerald; Lizbeth Laureano-Perez; Michelle M. Hammond; Leticia S. Pibida; Svetlana Nour; Brian E. Zimmerman;
Title: A New Primary Standardization of Th-229
Published: January 07, 2010
Abstract: The National Institute of Standards and Technology (NIST) has certified a high-purity Th-229 Standard Reference Material as SRM 4328C, based on live-timed 4-pi alpha,beta-gamma anticoincidence counting (LTAC) of the equilibrium solution. The LTAC system was optimized to minimize the uncertainty in the result due to the two short-lived ground-states present in the decay chain. Confirmatory measurements were carried out by four other methods. Furthermore, the present absolute activity and measured gamma-ray emission rates were combined to obtain gamma-ray emission probabilities.
Citation: Applied Radiation and Isotopes
Volume: 68
Pages: pp. 1303 - 1308
Keywords: mass spectrometry standard, primary standard, radioactivity, tracer, Th-229,
Research Areas: Calibrations (Ionizing Radiation)