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Semi-quantitative detection of 239Pu in the Antarctic plateau snow

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dc.contributor.authorHwang, Heejin-
dc.contributor.authorHan, Yeongcheol-
dc.contributor.authorLee, Jeonghoon-
dc.contributor.authorHur, Soon Do-
dc.contributor.authorHong, Sungmin-
dc.contributor.authorMotoyama, H-
dc.coverage.spatialAntarctic-
dc.coverage.spatialAntarctica-
dc.date.accessioned2017-08-03T12:08:24Z-
dc.date.available2017-08-03T12:08:24Z-
dc.date.issued2014-
dc.description.abstractPlutonium is a useful time marker for dating ice cores and snow pits because it in the environment mainly originates from atmospheric nuclear weapons tests carried out since the 1950s. To determine <sup>239</sup>Pu in snow pit samples, collected every 5 cm down to 4 m, covering ~50 years (1957-2007), at Dome Fuji in East Antarctica, we used an inductively coupled plasma-sector field mass spectrometer (ICP-SFMS) coupled to a high-efficiency sample introduction system. The main advantages of ICP-SFMS technique are rapidity of analysis and simple sample preparation method for <sup>239</sup>Pu at femtogram levels in small-volume samples from snow/ice. However, this technique is prone to spectral interferences. The existence of high content of uranium in sample could lead to significant interferences with <sup>239</sup>Pu owing to uranium hydride (238UH+) formation. In this study, we found that the interference effect of 238UH+ was negligible when the 238U concentrations lower than 10 pg g-1. In the snow pit samples, the 238U concentrations were lower than 0.5 pg g-1. Accordingly, <sup>239</sup>Pu signals were detected without 238UH+ interference. For the calculation of <sup>239</sup>Pu concentration, semi-quantitative method was used. It is based on assumption that the ionization energy for Pu and U are very close and therefore they should have a similar behavior when ionized in the plasma. Consequently, the <sup>239</sup>Pu records related to nuclear weapons tests were reconstructed at femtogram levels in the Antarctic snow pit sample by the application of a semi-quantitative method. It is demonstrated that ICP-SFMS technique represents a useful for the analysis of <sup>239</sup>Pu in the Antarctic samples.-
dc.languageEnglish-
dc.titleSemi-quantitative detection of <sup>239</sup>Pu in the Antarctic plateau snow-
dc.typeAbstract-
dc.identifier.bibliographicCitationHwang, Heejin, et al. 2014. Semi-quantitative detection of <sup>239</sup>Pu in the Antarctic plateau snow. SCAR Open Science Conference, XXXIII Scar Biennial Meetings and XXVI Comnap AGM. New Zealand. 2014. 08.23-09.03.-
dc.citation.conferenceDate2014. 08.23-09.03-
dc.citation.conferenceNameSCAR Open Science Conference, XXXIII Scar Biennial Meetings and XXVI Comnap AGM-
dc.citation.conferencePlaceNew Zealand-
dc.subject.keywordPlutonium-
dc.subject.keywordICP-SFMS-
dc.subject.keywordSnow-
dc.subject.keywordAntarctica-
Appears in Collections  
2014-2016, Investigation of Climate Change Mechanism by Observation and Simulation of Polar Climate for The Past and Present (14-16) / Kim, Seong-Joong (PE14010; PE15010; PE16010)
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