Analysis of ¹⁶¹Tb by radiochemical separation and liquid scintillation counting

Journal Article · Sat Dec 05 00:00:00 EST 2015 · Applied Radiation and Isotopes

DOI:https://doi.org/10.1016/j.apradiso.2015.12.004· OSTI ID:1250858

Jiang, J. ^[1]; Davies, A. ^[1]; Arrigo, L. ^[2]; Friese, J. ^[2]; Seiner, B. N. ^[2]; Greenwood, L. ^[2]; Finch, Z. ^[2]

---

1. AWE plc, Reading (United Kingdom)
2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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 Quantulus^TM 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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 1250858
• Journal Information: Applied Radiation and Isotopes, Journal Name: Applied Radiation and Isotopes Journal Issue: C Vol. 117; ISSN 0969-8043
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
CIEMAT/NIST method
Eichrom® LN Resin
Terbium-161
liquid scintillation counting