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Title: Application of the 226Ra– 230Th– 234U and 227Ac– 231Pa– 235U radiochronometers to UF 6 cylinders

Abstract

Uranium-series radiometric dating was performed on two well-pedigreed UF 6 cylinder samples containing highly enriched uranium that were in use at the Portsmouth Gaseous Diffusion Plant between the mid-1970s and mid-1980s. Daughter–parent (i.e. 231Pa– 235U, 230Th– 234U) radiometric ages determined on solid heel materials (e.g. UO 2F 2, UF 4) recovered from the emptied cylinders are unrealistically old due to the preferential sequestration of progeny isotopes relative to uranium within the solid heels. Furthermore, limited elemental fractionation amongst the progeny isotopes themselves in the heel material allowed for realistic age constraints on the fill dates of the UF 6 cylinders to be extracted from the granddaughter–daughter systems (i.e. 226Ra– 230Th, 227Ac– 231Pa).

Authors:
ORCiD logo [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1466910
Report Number(s):
LLNL-JRNL-747574
Journal ID: ISSN 0236-5731; 932482
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Radioanalytical and Nuclear Chemistry
Additional Journal Information:
Journal Volume: 317; Journal Issue: 2; Journal ID: ISSN 0236-5731
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; U-series radiochronometry; Nuclear forensics; Uranium hexafluoride; Age-dating; Isotope dilution MC-ICP-MS

Citation Formats

Rolison, John M., and Williams, Ross W. Application of the 226Ra–230Th–234U and 227Ac–231Pa–235U radiochronometers to UF6 cylinders. United States: N. p., 2018. Web. doi:10.1007/s10967-018-5955-5.
Rolison, John M., & Williams, Ross W. Application of the 226Ra–230Th–234U and 227Ac–231Pa–235U radiochronometers to UF6 cylinders. United States. doi:10.1007/s10967-018-5955-5.
Rolison, John M., and Williams, Ross W. Sat . "Application of the 226Ra–230Th–234U and 227Ac–231Pa–235U radiochronometers to UF6 cylinders". United States. doi:10.1007/s10967-018-5955-5. https://www.osti.gov/servlets/purl/1466910.
@article{osti_1466910,
title = {Application of the 226Ra–230Th–234U and 227Ac–231Pa–235U radiochronometers to UF6 cylinders},
author = {Rolison, John M. and Williams, Ross W.},
abstractNote = {Uranium-series radiometric dating was performed on two well-pedigreed UF6 cylinder samples containing highly enriched uranium that were in use at the Portsmouth Gaseous Diffusion Plant between the mid-1970s and mid-1980s. Daughter–parent (i.e. 231Pa–235U, 230Th–234U) radiometric ages determined on solid heel materials (e.g. UO2F2, UF4) recovered from the emptied cylinders are unrealistically old due to the preferential sequestration of progeny isotopes relative to uranium within the solid heels. Furthermore, limited elemental fractionation amongst the progeny isotopes themselves in the heel material allowed for realistic age constraints on the fill dates of the UF6 cylinders to be extracted from the granddaughter–daughter systems (i.e. 226Ra–230Th, 227Ac–231Pa).},
doi = {10.1007/s10967-018-5955-5},
journal = {Journal of Radioanalytical and Nuclear Chemistry},
number = 2,
volume = 317,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
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