Fitzgerald, R.
, Laureano-Perez, L.
, Hammond, M.
, Pibida, L.
, Nour, S.
and Zimmerman, B.
(2010),
A New Primary Standardization of Th-229, Applied Radiation and Isotopes
(Accessed October 10, 2025)
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A New Primary Standardization of Th-229
Published
Author(s)
, , , , ,
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
Pub Type
Journals
Keywords
mass spectrometry standard, primary standard, radioactivity, tracer, Th-229
Citation
Issues
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Created January 7, 2010, Updated February 19, 2017