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Snow MS, Ward J, Bucher B, Cooper JT, Kinlaw M, Cárdenas E, Horkley J, Town H, Finck M, Carney K. Rapid Separation of Photofissioned Uranium Products via a Single-Pass Multiplexed Chromatographic Fission Product Separation System. Anal Chem 2021; 93:3770-3777. [PMID: 33599129 DOI: 10.1021/acs.analchem.0c04130] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Current state-of-the-art fission product separations frequently involve multiple independent separation columns and sample manipulation processes; to couple these processes together, multiple evaporation and transposition steps are often required. The addition of these steps results in lengthy separation times, increased analysis costs, the potential for sample loss, and release of radioactive contamination. We report a new semiautomated method for the rapid separation of U, Zr, Mo, Ba, Sr, Te, and lanthanide fission products from irradiated uranium samples. Chemical yields for U, Zr, Ba, Sr, Te and the lanthanides from less than 3-day old uranium fission product samples are consistently greater than 90%, while those of Mo are greater than 70%. This method minimizes the use and addition of oxidation and reduction reagents that often cause issues with retention and separation. Uranium dissolution and fission product separations using this single-pass method are achievable in under 2 h, representing a significant improvement over traditional gravimetric uranium fission product separation procedures.
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Affiliation(s)
- Mathew S Snow
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Jessica Ward
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Brian Bucher
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Justin T Cooper
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Mathew Kinlaw
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Edna Cárdenas
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Jared Horkley
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Hayden Town
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Martha Finck
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
| | - Kevin Carney
- Idaho National Laboratory, P.O. Box 1625, Idaho Falls, Idaho 83415-2805, United States
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Schmidt KH, Jurado B. Review on the progress in nuclear fission-experimental methods and theoretical descriptions. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:106301. [PMID: 29952321 DOI: 10.1088/1361-6633/aacfa7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An overview is given on some of the main advances in the experimental methods, experimental results, theoretical models and ideas of the last few years in the field of nuclear fission. New approaches have considerably extended the availability of fissioning systems for the experimental study of nuclear fission, and have provided a full identification of all fission products in A and Z for the first time. In particular, the transition from symmetric to asymmetric fission around 226Th, some unexpected structures in the mass distributions in the fission of systems around Z = 80-84, and an extended systematics of the odd-even effect in the fission fragment Z distributions have all been measured (Andreyev et al 2018 Rep. Prog. Phys. 81 016301). Three classes of model descriptions of fission presently appear to be the most promising or the most successful. Self-consistent quantum-mechanical models fully consider the quantum-mechanical features of the fission process. Intense efforts are presently being made to develop suitable theoretical tools (Schunck and Robledo 2016 Rep. Prog. Phys. 79 116301) for modeling the non-equilibrium, large-amplitude collective motion leading to fission. Stochastic models provide a fully developed technical framework. The main features of the fission-fragment mass distribution have been well reproduced from mercury to fermium and beyond (Möller and Randrup 2015 Phys. Rev. C 91 044316). However, limited computer resources still impose restrictions, for example, on the number of collective coordinates and on an elaborate description of the fission dynamics. In an alternative semi-empirical approach (Schmidt et al 2016 Nucl. Data Sheets 131 107), considerable progress in describing the fission observables has been achieved by combining several theoretical ideas, which are essentially well known. This approach exploits (i) the topological properties of a continuous function in multidimensional space, (ii) the separability of the influence of fragment shells and the macroscopic properties of the compound nucleus, (iii) the properties of a quantum oscillator coupled to a heat bath of other nuclear degrees of freedom, (iv) an early freeze-out of collective motion, and (v) the application of statistical mechanics for describing the thermalization of intrinsic excitations in the nascent fragments. This new approach reveals a high degree of regularity and allows the calculation of high-quality data that is relevant to nuclear technology without specifically adjusting the empirical data of individual systems.
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Affiliation(s)
- Karl-Heinz Schmidt
- CENBG, CNRS/IN2 P3, Chemin du Solarium B.P. 120, F-33175 Gradignan, France
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