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Title: Analysis of 161Tb by radiochemical separation and liquid scintillation counting

The determination of 161Tb activity is problematic due to its very low fission yield, short half-life, and the complication of its gamma spectrum. At AWE, radiochemically purified 161Tb solution was measured on a PerkinElmer 1220 QuantulusTM Liquid Scintillation Spectrometer. Since there was no 161Tb certified standard solution available commercially, the counting efficiency was determined by the CIEMAT/NIST Efficiency Tracing method. The method was validated during a recent inter-laboratory comparison exercise involving the analysis of a uranium sample irradiated with thermal neutrons. Lastly, the measured 161Tb result was in excellent agreement with the result using gamma spectrometry and the result obtained by Pacific Northwest National Laboratory.
 [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2]
  1. AWE plc, Reading (United Kingdom)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Applied Radiation and Isotopes
Additional Journal Information:
Journal Volume: 117; Journal Issue: C; Journal ID: ISSN 0969-8043
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
Country of Publication:
United States
07 ISOTOPE AND RADIATION SOURCES; Terbium-161; Eichrom® LN Resin; liquid scintillation counting; CIEMAT/NIST method