Half-life determination of the ground state decay of 167Tm and 168Tm
Precise determination of half-lives of 167Tm and 168Tm are important for their application in nuclear medicine diagnostics, nuclear forensics, and other nuclear data measurements. We produced 167Tm and 168Tm sources using an α-particle beam bombarded 165Ho target and a series purification steps. A s...
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Veröffentlicht in: | Applied radiation and isotopes 2024-07, Vol.209, p.111339-111339, Article 111339 |
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Sprache: | eng |
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Zusammenfassung: | Precise determination of half-lives of 167Tm and 168Tm are important for their application in nuclear medicine diagnostics, nuclear forensics, and other nuclear data measurements. We produced 167Tm and 168Tm sources using an α-particle beam bombarded 165Ho target and a series purification steps. A series of 173 measurements was performed over a period of 44 days using a high-purity germanium (HPGe) detector to track the count rate change as a function of time by following the 207.8 keV and 531.5 keV γ-lines to determine the radioactive decay half-life of 167Tm. The measurement of half-life of 168Tm ground state has been performed using the same HPGe γ-ray spectrometer to observe γ-lines at 198.3 keV, 816.0 keV, 184.3 keV, 741.4 keV and 914.9 keV. Weighted least-squares fits of exponential decay curves were performed for the dataset of each γ-ray emission, with final determined half-lives of 9.250(15) d and 93.41(12) d for 167Tm and 168Tm, respectively. The uncertainty budgets are presented and discussed in detail. Our result of 167Tm half-life is consistent with the Evaluated Nuclear Structure Data File (ENSDF) recommended half-life of 9.25(2) d. The outcome of 168Tm half-life determination is longer than the ENSDF recommended half-life of 93.1(2) d. Further independent measurements would be ideal to resolve the discrepancy.
•The half-lives obtained for 167Tm and 168Tm are 9.250(15) days and 93.41(12) days, respectively.•The 168Tm half-life value of 93.41(12) d determined in this work deviates by 0.33% from the recommended value of 93.1(2) d.•The half-life of 168Tm determined by the PMM method was 93.21(12) d. |
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ISSN: | 0969-8043 1872-9800 |
DOI: | 10.1016/j.apradiso.2024.111339 |