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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|
|Pages:||pp. 1303 - 1308|
|Keywords:||mass spectrometry standard, primary standard, radioactivity, tracer, Th-229,|
|Research Areas:||Calibrations (Ionizing Radiation)|