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On the accuracy of gamma spectrometric isotope ratio measurements of uranium

Henrik Ramebäck (Institutionen för kemi och kemiteknik, Kärnkemi) ; P. Lagerkvist ; S. Holmgren ; S. Jonsson ; B. Sandstrom ; A. Tovedal ; Anna Vesterlund (Institutionen för kemi och kemiteknik, Kärnkemi) ; T. Vidmar ; J. Kastlander
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment (0168-9002). Vol. 815 (2016), p. 57-61.
[Artikel, refereegranskad vetenskaplig]

The isotopic composition of uranium was measured using high resolution gamma spectrometry. Two acid solutions and two samples in the form of UO2 pellets were measured. The measurements were done in close geometries, i.e. directly on the endcap of the high purity germanium detector (HPGe). Applying no corrections for count losses due to true coincidence summing (TCS) resulted in up to about 40% deviation in the abundance of U-235 from the results obtained with mass spectrometry. However, after correction for TCS, excellent agreement was achieved between the results obtained using two different measurement methods, or a certified value. Moreover, after corrections, the fitted relative response curves correlated excellently with simulated responses, for the different geometries, of the HPGe detector.

Nyckelord: Uranium, Isotope ratio, Gamma spectrometry, True coincidence summing, Nuclear Forensics International Working, Group (ITWG), 4th Collaborative Material Exercise (CMX-4)

Denna post skapades 2016-03-09.
CPL Pubid: 232967


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Institutionen för kemi och kemiteknik, Kärnkemi



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