Determination of the gamma and X-ray emission intensities of terbium-161

Frédéric Juget; Zeynep Talip; Thierry Buchillier; M Teresa Durán; Youcef Nedjadi; Laurent Desorgher; François Bochud; Pascal Grundler; Nicholas P van der Meulen; Claude Bailat

doi:10.1016/j.apradiso.2021.109770

Determination of the gamma and X-ray emission intensities of terbium-161

Appl Radiat Isot. 2021 Aug:174:109770. doi: 10.1016/j.apradiso.2021.109770. Epub 2021 May 23.

Affiliations

¹ Institute of Radiation Physics, Lausanne, Switzerland. Electronic address: frederic.juget@chuv.ch.
² Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, Villigen-PSI, Switzerland.
³ Institute of Radiation Physics, Lausanne, Switzerland.
⁴ Center for Radiopharmaceutical Sciences ETH-PSI-USZ, Paul Scherrer Institute, Villigen-PSI, Switzerland; Laboratory of Radiochemistry, Paul Scherrer Institute, Villigen-PSI, Switzerland.

PMID: 34051529
DOI: 10.1016/j.apradiso.2021.109770

Abstract

In this study, the gamma and X-ray emission intensities of ¹⁶¹Tb were determined using a high-purity germanium spectrometer. The samples used were previously standardised by coincidence counting and Triple to Double Coincidence Ratio (TDCR) methods. A total of 28 gamma-rays and 4 X-rays were measured and compared with previous measurements performed more than 30 years ago. Most of the lines are in agreement, while large discrepancies are observed for 5 lines. The uncertainties have been dramatically decreased with respect to previous measurements giving a better knowledge of the ¹⁶¹ Tb day.

Keywords: (161)Tb; gamma-ray emission intensities; gamma-ray spectrometry.