Feasibility of Using Graphite Powder to Enhance Uranium Ion Intensity in Thermal Ionization Mass Spectrometry (TIMS)

Park Jeng-Ho

doi:10.5478/MSL.2016.7.4.102

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P-ISSN2233-4203
E-ISSN2093-8950
ESCI, SCOPUS, KCI

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P-ISSN 2233-4203
E-ISSN 2093-8950

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Vol.7, No.4

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Feasibility of Using Graphite Powder to Enhance Uranium Ion Intensity in Thermal Ionization Mass Spectrometry (TIMS)

Mass Spectrometry Letters / Mass Spectrometry Letters, (P)2233-4203; (E)2093-8950

2016, v.7 no.4, pp.102-105

https://doi.org/10.5478/MSL.2016.7.4.102

Park Jeng-Ho (Korea Atomic Energy Research Institute, University of Science and Technology)

Park, J. (2016). Feasibility of Using Graphite Powder to Enhance Uranium Ion Intensity in Thermal Ionization Mass Spectrometry (TIMS). Mass Spectrometry Letters, 7(4), 102-105, https://doi.org/10.5478/MSL.2016.7.4.102

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Abstract

This study explored the feasibility of using a carburization technique to enhance the ion intensity of isotopic analysis of ultra-trace levels of uranium using thermal ionization mass spectrometry (TIMS). Prior to fixing uranium samples on TIMS filaments, graphite powder suspended in nitric acid was deposited on rhenium filaments. We observed an enhancement of 238U+ intensity by a factor of two when carburization was used, and were able to roughly optimize the amount of graphite powder necessary for carburization. The positive shift in heating current when evaporating filaments upon carburization implies that uranium was chemically altered by carburization, when compared to normal fixation processes. The good agreement between our method and known standards down to an ultra-trace level shows that the proposed technique can be applied to isotopic uranium analysis down to abundances of ~10 pg.

keywords: carburization, thermal ionization mass spectrometry (TIMS), uranium, nuclear safeguards

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