234U/238U signatures associated with uranium ore bodies: part 3 Koongarra

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dc.contributor.authorLowson, RTen_AU
dc.date.accessioned2014-06-19T01:41:33Zen_AU
dc.date.available2014-06-19T01:41:33Zen_AU
dc.date.issued2013-04-01en_AU
dc.date.statistics2014-06-19en_AU
dc.description.abstractThe Koongarra ore body is an early Proterozoic U ore body in the Alligator Rivers U province, Northern Territory, Australia. It has surface expression with a redox front located similar to 30 m below the surface. The U-234/U-238 activity ratios (AR) for the ground water and the amorphous phase of the solid have been analysed for the ore zone and dispersion halo as a function of depth. The results display a U-234/U-238 AR signature with depth which may be common to all U ore bodies. The U-234/U-238 AR is depressed below secular equilibrium in the weathered material above the redox front; rises significantly above secular equilibrium in the vicinity of the redox front; and is followed by a gradual decrease with depth below the redox front. The amplitude of the profile is a function of local conditions. A model is proposed for the signature in which oxidising waters preferentially leach the U-234 sites at the redox front due to preconditioning of the U-234 sites by a recoil during the decay of U-238 to U-234. Mass balance requires the solid material left behind the redox front to have a U-234/U-238 AR reduced below I. Local second order effects may be superimposed on the signature. The signature may have application to calibrating scenarios for nuclear waste repositories, assisting in understanding historical climates, economic evaluation of U ore bodies and U exploration. © 2013, Elsevier Ltd.en_AU
dc.identifier.citationLowson, R. T. (2013). 234U/238U signatures associated with uranium ore bodies: part 3 Koongarra. Journal of Environmental Radioactivity, 118, 163-168. doi:10.1016/j.jenvrad.2012.10.004en_AU
dc.identifier.govdoc4683en_AU
dc.identifier.issn0265-931Xen_AU
dc.identifier.journaltitleJournal of Environmental Radioactivityen_AU
dc.identifier.pagination163-168en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jenvrad.2012.10.004en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5698en_AU
dc.identifier.volume118en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science Ltden_AU
dc.subjectUranium oresen_AU
dc.subjectUraniumen_AU
dc.subjectOresen_AU
dc.subjectRadioisotopesen_AU
dc.subjectAustraliaen_AU
dc.subjectGround wateren_AU
dc.title234U/238U signatures associated with uranium ore bodies: part 3 Koongarraen_AU
dc.typeJournal Articleen_AU
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