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A new measurement of the 122Sb half-life. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07793-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractFollowing significant discrepancies observed when decay-correcting 122Sb γ-peak count rates to a reference time, we looked at the literature supporting the presently recommended 2.7238(2) d (1σ) 122Sb half-life value as the source of these discrepancies. Investigation revealed that the value was derived from an inconsistent dataset and was published without reporting details of the experiment nor the uncertainty budget. In this work we performed a new measurement of the 122Sb half-life by measuring the 122Sb decay of neutron-activated antimony samples using state-of-the-art γ-detection systems characterized in terms of efficiency drift and random pulse pile-up. The measurement was carried out in two different laboratories with the same method. The resulting 2.69454(39) d and 2.69388(30) d (1σ) 122Sb half-life values are in agreement at the evaluated 10–4 relative combined standard uncertainty level but are significantly lower (1.07% and 1.10% lower, respectively) than the preexisting recommended value.
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Affiliation(s)
- J. F. Emery
- Oak Ridge National Laboratory, Analytical Chemistry Division Oak Ridge, Tennessee 37830
| | - S. A. Reynolds
- Oak Ridge National Laboratory, Analytical Chemistry Division Oak Ridge, Tennessee 37830
| | - E. I. Wyatt
- Oak Ridge National Laboratory, Analytical Chemistry Division Oak Ridge, Tennessee 37830
| | - G. I. Gleason
- Oak Ridge Associated Universities, Special Training Division Oak Ridge, Tennessee 37830
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