Hannover 2010 – wissenschaftliches Programm
MS 3.2: Vortrag
Dienstag, 9. März 2010, 14:30–14:45, F 428
Thermal ionization mass spectrometry (TIMS) of actinides: Pushing the limits of accuracy and detection — •Stefan Bürger1, Sergei Boulyga1, Alan Cunningham1, Dilani Klose1, Andreas Koepf1, Jane Poths1, and Stephan Richter2 — 1Safeguards Analytical Laboratory, International Atomic Energy Agency, Vienna, Austria — 2Institute for Reference Materials and Measurements, JRC-EU, Retieseweg 111, 2440 Geel, Belgium
New method developments in multi-collector thermal ionization mass spectrometry (MC-TIMS) for actinide isotope ratio analysis to improve accuracy and limits of detection will be presented. With respect to limits of detection, results on improving work function using various carbon additives will be reviewed and presented as well as developments in cavity ion source (as compared to standard flat ribbon filament ion source) for femto- and attogram levels of uranium, plutonium, and americium. With respect to accuracy, results on isotope ratio measurements of isotopes of uranium (relative accuracy of 0.3 % to 0.01 %) will be presented with an example being U-234-Th-230 age-dating (NBL CRM 112-A). In this context, the importance of traceability (to the S.I. units) and the use of (certified) reference materials will be emphasized. The focus of this presentation will be on applications to nuclear safeguards / forensics.