Progress in sample preparation system for the Seoul National University AMS facility

The Seoul National University AMS Laboratory has developed a sample preparation system for AMS measurement. Graphite targets are prepared via the reduction of carbon dioxide over a Fe catalyst. The carbon dioxide gases are produced by combusting pretreated organic samples with CuO and silver wire in a sealed quartz tube. Each combustion produces ca. 2 mg of graphite that is loaded into the target. So far we have been successful in extracting and analyzing C-12(-) current up to 10 mA in stable condition by Cs sputtering onto the targets. (C) 2000 Elsevier Science B.V. All rights reserved.