Isotopic U- U- Th- Th analysis using LA-ICPMS for direct U/Th dating of millennium stalagmites

  • Wu Chung-Che
  • Shen Chuan-Chou
  • Günther Detlef
  • Hattendorf Bodo
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Publication date
July 2022

Abstract

Here we present high sensitivity, in situ Th and U isotope ratio determinations in carbonates using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Online addition of a well characterized 229Th-233U-236U isotopic spike to the laser generated aerosol by means of a desolvating nebulizer enabled to monitor and correct for mass discrimination and elemental fractionation effects of U and Th. The efficacy of inter-element, mass discrimination, and peak tailing baseline corrections were critically evaluated and optimized. Using a “jet” interface ICPMS setup improved the detection efficiency to a yield of 1-2%. Thereby sufficiently high signal intensities have been achieved even for the low abundant isotope 230Th in stalagmi...

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