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MS: Massenspektrometrie

MS 3: Laser Resonance Ionization Mass Spectrometry

MS 3.3: Talk

Tuesday, April 3, 2001, 16:30–16:45, EB 202

Resonance Ionization Mass Spectrometry Measurements of ¹³⁵Cs/¹³⁷Cs Isotopic Ratio — •L. Pibida¹, W. Nörtershäuser², and B.A. Bushaw³ — ¹National Institute of Standards and Technology, Gaithersburg, MD, USA — ²Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany — ³Pacific North West Laboratories, Richland, NY, USA

A continuous-wave resonance ionization mass spectrometry (cw-RIMS) system at PNNL was used for isotopic ratio measurements of ¹³⁵Cs/¹³⁷Cs. The results are compared with values measured by thermal ionization mass spectrometry (TIMS) and the chronological age of a burn-up sample was determined. The overall RIMS efficiency was found to be 5×10⁻⁶ with a combined selectivity of approximately 1×10¹⁰. RIMS was shown to be a useful technique for the determination of the chronological age of radioactive waste by measuring the isotopic ratio of ¹³⁵Cs/¹³⁷Cs. Measurements of ¹³⁵Cs/¹³⁷Cs in soil and river sediments are foreseen.