| 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) |
