Measurement of Pu and U isotopes on the 1 MV AMS system at the Centro

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dc.contributor.authorChamizo, Een_AU
dc.contributor.authorGarcía-León, Men_AU
dc.contributor.authorGarcía-Tenorio, Ren_AU
dc.contributor.authorHotchkis, MACen_AU
dc.date.accessioned2012-04-17T05:47:07Zen_AU
dc.date.available2012-04-17T05:47:07Zen_AU
dc.date.issued2011-03-24en_AU
dc.date.statistics2012-04-17en_AU
dc.description.abstractIn the last decade, compact AMS systems have demonstrated their potential to measure actinides (236U, 239,240,244Pu, 237Np). With an appropriate detection system, kinematic filters with enough mass resolution, and a simple chemical procedure, the determination of plutonium isotopes and 237Np at environmental levels is currently possible with this new generation of facilities with even better performance than with conventional AMS systems. However, the measurement of 236U (T1/2=23.4 My), produced by neutron capture on 235U, is still a challenge, due to the interference caused by 235U and 238U. In this work, we will explore the possibilities that the 1 MV AMS system at the CNA offers for the measurement of uranium isotopes at environmental levels, in terms of detection limit, efficiency, and precision. Considering the very promising 239Pu/238U mass suppression factor achieved with our system, of about 10-9, a limiting 236U/238U atomic ratio of about 10-11 was expected, approaching the levels expected in natural uranium. However, to date, only the 10-9 level has been obtained, possibly due to the lack of an appropriate uranium material. Currently, different natural uranium materials are being studied, in order to elucidate the origin of the interference. On the other hand, we will discuss the status of the plutonium measurements at our facility, based on the experience we have accumulated in recent years from the analysis of different matrixes over a wide range of plutonium concentrations.Copyright (c) 2011 AMS12.en_AU
dc.identifier.citationChamizo, E., García-León, M., García-Tenorio. R, Hotchkis, M., (2011). Measurement of Pu and U isotopes on the 1 MV AMS system at the Centro. Paper presented to the 12th International Conference on Accelerator Mass Spectrometry (AMS 12), 20th - 25th March 2011. Museum of New Zealand: Te Papa Tongarewa, Wellington, New Zealand.en_AU
dc.identifier.conferenceenddate25 March 2011en_AU
dc.identifier.conferencename12th International Conference on Accelerator Mass Spectrometry (AMS 12)en_AU
dc.identifier.conferenceplaceWellington, New Zealanden_AU
dc.identifier.conferencestartdate20 March 2011en_AU
dc.identifier.govdoc4287en_AU
dc.identifier.urihttp://www.gns.cri.nz/ams12/ams12_programme.html#Scheduleen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4139en_AU
dc.language.isoenen_AU
dc.publisher12th International Conference on Accelerator Mass Spectrometryen_AU
dc.subjectIsotopesen_AU
dc.subjectUranium 236en_AU
dc.subjectActinidesen_AU
dc.subjectPlutoniumen_AU
dc.subjectCaptureen_AU
dc.subjectDetectionen_AU
dc.titleMeasurement of Pu and U isotopes on the 1 MV AMS system at the Centroen_AU
dc.typeConference Presentationen_AU
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