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Nucleogenic 36 Cl, 236 U and 239 Pu in uranium ores

Wilcken, Klaus; Fifield, L Keith; Barrows, Timothy; Tims, Stephen; Gladkis, Laura

Description

The nucleogenic isotopes 36Cl, 236U and 239Pu are produced naturally in subsurface environments via neutron capture of thermal and epithermal neutrons. Concentrations are, however, very low and accelerator mass spectrometry (AMS) is required for quantitative measurements. A particular challenge is presented by the measurement of 236U/238U ratios down to the level of 10-13 that is expected from rocks with low uranium concentration. Here, we present the AMS methodology that has been developed at...[Show more]

dc.contributor.authorWilcken, Klaus
dc.contributor.authorFifield, L Keith
dc.contributor.authorBarrows, Timothy
dc.contributor.authorTims, Stephen
dc.contributor.authorGladkis, Laura
dc.date.accessioned2015-12-10T22:27:45Z
dc.identifier.issn0168-583X
dc.identifier.urihttp://hdl.handle.net/1885/54345
dc.description.abstractThe nucleogenic isotopes 36Cl, 236U and 239Pu are produced naturally in subsurface environments via neutron capture of thermal and epithermal neutrons. Concentrations are, however, very low and accelerator mass spectrometry (AMS) is required for quantitative measurements. A particular challenge is presented by the measurement of 236U/238U ratios down to the level of 10-13 that is expected from rocks with low uranium concentration. Here, we present the AMS methodology that has been developed at the ANU for measuring 236U/238U ratios at this level. The more established methodologies for 36Cl and 239Pu measurements are also summarised. These capabilities are then used to characterize the 36Cl, 236U and 239Pu concentrations in a range of uranium ores. A simple model of the neutron production and capture processes in subsurface environments has been developed and is presented. It is shown that nucleogenic 36Cl, 236U and 239Pu can be used to determine both thermal and epithermal neutron fluxes in subsurface environments. Potential applications include uranium exploration and monitoring of the environmental impact of uranium mining.
dc.publisherElsevier
dc.sourceNuclear Instruments and Methods in Physics Research: Section B
dc.subjectKeywords: 236 U; 239 Pu; 36 Cl; AMS; Nucleogenic isotope production; Uranium ore; Isotopes 236U; 239Pu; 36Cl; AMS; Nucleogenic isotope production; Uranium ore
dc.titleNucleogenic 36 Cl, 236 U and 239 Pu in uranium ores
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume266
dc.date.issued2008
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.absfor029904 - Synchrotrons; Accelerators; Instruments and Techniques
local.identifier.ariespublicationu4155331xPUB298
local.type.statusPublished Version
local.contributor.affiliationWilcken, Klaus, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFifield, L Keith, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBarrows, Timothy, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationTims, Stephen, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGladkis, Laura, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue16
local.bibliographicCitation.startpage3614
local.bibliographicCitation.lastpage3624
local.identifier.doi10.1016/j.nimb.2008.06.009
dc.date.updated2015-12-09T09:43:23Z
local.identifier.scopusID2-s2.0-49449116330
local.identifier.thomsonID000259429100016
CollectionsANU Research Publications

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