Ionisation efficiency improvements for AMS measurement of actinides

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dc.contributor.authorChild, DPen_AU
dc.contributor.authorHotchkis, MACen_AU
dc.contributor.authorWhittle, KRen_AU
dc.contributor.authorZorko, Ben_AU
dc.date.accessioned2010-07-02T06:47:09Zen_AU
dc.date.available2010-07-02T06:47:09Zen_AU
dc.date.issued2010-04en_AU
dc.date.statistics2010-04en_AU
dc.descriptionPhysical copy held by ANSTO Library at DDC 539.7.56en_AU
dc.description.abstractMeasurements of the isotopic ratios of plutonium and uranium are utilised by the safeguards community, environmental radioactivity and remediation studies, oceanography research, and in the U-series dating of geological samples. Accelerator Mass Spectrometry offers the advantages of high selectivity and sensitivity for such ratio measurements, but suffers from a poorer ionisation and transmission efficiency than some other mass spectrometric techniques. In addition, the ionisation efficiency achieved in caesium-sputter ion sources can be variable depending on the chemical form and geometry of the target used, yielding actinide negative ion beam rates with efficiencies ranging from 0.05% to 0.5%. In this paper we investigate the impact of the crystal structure of the target material, chemical composition and the geometry of the target in order to determine conditions which will allow us to maximise beam output and increase the efficiency of AMS measurements in future. We also examine target stability and “burn in time” (the time taken to generate a stable beam current) in conjunction with these measurements in order to maintain a high precision of measurement during the measurement period. © 2009 Published by Elsevier B.V.en_AU
dc.identifier.citationChild, D. P., Hotchkis, M. A. C., Whittle, K., & Zorko, B. (2010). Ionisation efficiency improvements for AMS measurement of actinides. Paper presented to the 11th International Conference on Accelerator Mass Spectrometry (AMS-11), 14th – 19th September 2008. Spazio Etoile, Rome. In Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 268(7-8), 820-823. doi:10.1016/j.nimb.2009.10.039en_AU
dc.identifier.conferenceenddate19 September 2008en_AU
dc.identifier.conferencename11th International Conference on Accelerator Mass Spectrometry (AMS-11)en_AU
dc.identifier.conferenceplaceSpazio Etoile, Romeen_AU
dc.identifier.conferencestartdate14 September 2008en_AU
dc.identifier.govdoc1826en_AU
dc.identifier.issn0168-583Xen_AU
dc.identifier.issue7-8en_AU
dc.identifier.journaltitleNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atomsen_AU
dc.identifier.pagination820-823en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.nimb.2009.10.039en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1727en_AU
dc.identifier.volume268en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPlutoniumen_AU
dc.subjectUraniumen_AU
dc.subjectMass spectroscopyen_AU
dc.subjectSputteringen_AU
dc.subjectEfficiencyen_AU
dc.subjectIonizationen_AU
dc.titleIonisation efficiency improvements for AMS measurement of actinidesen_AU
dc.typeConference Paperen_AU
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