Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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A Correction Method for the Peak Tailing Backgrounds for Accurate Isotope Ratio Measurements of Uranium in Ultra Trace Levels using Thermal Ionization Mass Spectrometry

  • Park, Jong-Ho (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Choi, In-Hee (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Park, Su-Jin (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Lee, Myung-Ho (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Song, Kyu-Seok (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute)
  • Received : 2011.09.19
  • Accepted : 2011.10.15
  • Published : 2011.12.20
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Abstract

A new method in thermal ionization mass spectrometry (TIMS) was developed to correct peak tailing backgrounds in the isotope ratio measurements of uranium in ultra trace levels for higher accuracy. Two different uranium standard reference materials (U005 and U030) were used to construct databases of signal intensities at mass 234 u and mass 236 u, which correspond to the two uranium minor isotopes, and signal intensity of $^{238}U$. Correlations between peak tailing backgrounds and $^{238}U$ were obtained by least-squares regression on calculated backgrounds at mass 234 u and mass 236 u with respect to the signal intensity of $^{238}U$ followed by separation of the peak tails of the two major isotopes of uranium ($^{235}U$ and $^{238}U$), which enables us to obtain a master equation for peak tailing background correction on all kinds of samples. Verification of the correction method was carried out using U010 and IRMM-040a.

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