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  • 1 University of California Nuclear Science Division, MS-70/319, Lawrence Berkeley National Laboratory, and Chemistry Department Berkeley CA 94720 USA
  • | 2 Chalmers University of Technology Department of Nuclear Chemistry S-412 96 Göteborg Sweden
  • | 3 Delft University of Technology Department of Radiochemistry, Interfaculty Reactor Institute Mekelweg 15 2628 JB Delft The Netherlands
  • | 4 University of Oslo Department of Chemistry N-0315 Oslo Norway
  • | 5 Johannes Gutenberg-Universität Mainz Institut für Kernchemie D-55099 Mainz Germany
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Subsecond 224 Pa (T1/2 = 0.85 s) was produced via the 209 Bi(18 O,3n)224 Pa reaction at the 88 inch cyclotron at the Lawrence Berkeley National Laboratory. After production it was transported via a gas-jet system to the centrifuge system SISAK 3. Following on-line extraction with trioctylamine/scintillation solutions from 1M lactic acid, 224 Pa was detected applying on-line -liquid scintillation counting. Unambiguous identification was achieved using time-correlated --decay chain analysis. This constitutes the first chemical on-line separation and detection of a subsecond -decaying nuclide, 0.85-s 224 Pa with the fast extraction system SISAK 3.