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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 resulted in unrealistically old ages due to the preferential sequestration of progeny isotopes within the solid heels. However, limited elemental fractionation amongst the progeny isotopes themselves in the heel material allowed for useful age constraints on the fill dates of the UF6 cylinders to be extracted from the granddaughter-daughter systems (i.e. 226Ra- 230Th, 227Ac- 231Pa).

Authors:
 [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
OSTI Identifier:
1430909
Report Number(s):
LLNL-TR-746145
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND RUEL MATERIALS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 07 ISOTOPES AND RADIATION SOURCES; 15 GEOTHERMAL ENERGY; 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:10.2172/1430909.
Rolison, John M., & WIlliams, Ross W.. Application of the 226Ra-230Th-234U and 227Ac-231Pa-235U radiochronometers to UF6 Cylinders. United States. doi:10.2172/1430909.
Rolison, John M., and WIlliams, Ross W.. Mon . "Application of the 226Ra-230Th-234U and 227Ac-231Pa-235U radiochronometers to UF6 Cylinders". United States. doi:10.2172/1430909. https://www.osti.gov/servlets/purl/1430909.
@article{osti_1430909,
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 resulted in unrealistically old ages due to the preferential sequestration of progeny isotopes within the solid heels. However, limited elemental fractionation amongst the progeny isotopes themselves in the heel material allowed for useful 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 = {10.2172/1430909},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 29 00:00:00 EST 2018},
month = {Mon Jan 29 00:00:00 EST 2018}
}

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