DOI QR코드

DOI QR Code

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

  • Park, Jong-Ho (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute)
  • 투고 : 2016.11.24
  • 심사 : 2016.12.08
  • 발행 : 2016.12.30

초록

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 $^{238}U^+$ 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.

키워드

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피인용 문헌

  1. Experimental evaluation of uranium ion signal intensity enhancement of TIMS using graphite powder deposition on uranium samples vol.316, pp.3, 2018, https://doi.org/10.1007/s10967-018-5768-6