Determination of the 161Tb half-life

Collins, Sean M.; Gilligan, Chris; Pierson, Bruce D.; Ramirez, Natasha; Goodwin, Matthew; Pearce, Andy K.; Archambault, Brian C.; Haney, Morgan M.; Regan, Paddy H.

doi:10.1016/j.apradiso.2022.110140

Determination of the ¹⁶¹Tb half-life

Journal Article · Mon Feb 07 00:00:00 EST 2022 · Applied Radiation and Isotopes

DOI:https://doi.org/10.1016/j.apradiso.2022.110140· OSTI ID:2997703

^[1]; Gilligan, Chris ^[2]; ^[3]; Ramirez, Natasha ^[4]; ^[5]; Pearce, Andy K. ^[4]; ^[3]; Haney, Morgan M. ^[3]; Regan, Paddy H. ^[1]

National Physical Laboratory, Teddington (United Kingdom); Univ. of Surrey, Guildford (United Kingdom)
Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
National Physical Laboratory, Teddington (United Kingdom)
Univ. of Surrey, Guildford (United Kingdom); Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)

There is significant interest in the use of terbium radioisotopes for applications in cancer therapy and diagnosis. Of these, ¹⁶¹Tb, a medium energy beta- and prolific auger emitter, is being investigated as a potential alternative to ¹⁷⁷Lu. The higher proportion of conversion electron and Auger electron emissions, and variety of low-energy gammas make ¹⁶¹Tb an attractive targeted theranostic. As a product of nuclear fission, ¹⁶¹Tb is also of importance to nuclear forensics. The current evaluated half-life of 6.89(2) d has a standard uncertainty that contributes significantly to the standard uncertainty of decay calculated activity determination. Furthermore, the accuracy of this evaluated half-life has been called into question by measurements reported recently at the Institute of Radiation Physics (IRP), Switzerland. In this work, the half-life of ¹⁶¹Tb was measured at three independent laboratories located in the United Kingdom and United States of America for a total of five determinations using three independent measurement techniques. In conclusion, the half-life determined for ¹⁶¹Tb of 6.9637(29) d confirms the observed 1 % relative increase observed by IRP, though the reported half-lives in this work and at IRP are significantly different (ζ-score = 3.1).

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: Science and Technology Facilities Council (STFC); USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2997703

Alternate ID(s):: OSTI ID: 1844801

Report Number(s):: PNNL-SA--167400

Journal Information:: Applied Radiation and Isotopes, Journal Name: Applied Radiation and Isotopes Vol. 182; ISSN 0969-8043

Publisher:: Elsevier BVCopyright Statement

Country of Publication:: United States

Language:: English

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