Issue 5, 2013

235U–231Pa age dating of uranium materials for nuclear forensic investigations

Abstract

Age dating of nuclear material can provide insight into source and suspected use in nuclear forensic investigations. We report here a method for the determination of the date of most recent chemical purification for uranium materials using the 235U-231Pa chronometer. Protactinium is separated from uranium and neptunium matrices using anion exchange resin, followed by sorption of Pa to an SiO2 medium. The concentration of 231Pa is measured by isotope dilution mass spectrometry using 233Pa spikes prepared from an aliquot of 237Np and calibrated in-house using the rock standard Table Mountain Latite and the uranium isotopic standard U100. Combined uncertainties of age dates using this method are 1.5 to 3.5 %, an improvement over alpha spectrometry measurement methods. Model ages of five uranium standard reference materials are presented; all standards have concordant 235U-231Pa and 234U-230Th model ages.

Graphical abstract: 235U–231Pa age dating of uranium materials for nuclear forensic investigations

Supplementary files

Article information

Article type
Paper
Submitted
07 Feb 2013
Accepted
14 Mar 2013
First published
03 Apr 2013

J. Anal. At. Spectrom., 2013,28, 666-674

235U–231Pa age dating of uranium materials for nuclear forensic investigations

G. R. Eppich, R. W. Williams, A. M. Gaffney and K. C. Schorzman, J. Anal. At. Spectrom., 2013, 28, 666 DOI: 10.1039/C3JA50041A

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