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  • 1 Tokyo Metropolitan University Graduate School of Science and Engineering 1-1 Minamioosawa Hachioji, Tokyo 192-0397 Japan
  • | 2 RIKEN Nishina Center for Accelerator Based Science Wako, Saitama 351-0198 Japan
  • | 3 Japan Atomic Energy Agency Advanced Science Research Center Tokai, Ibaraki 319-1195 Japan
  • | 4 University of Tsukuba Graduate School of Pure and Applied Sciences Tsukuba, Ibaraki 305-8577 Japan
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The properties of a metallofullerene that encapsulates 225Ac were studied by radio-chromatographic methods. The results of chromatography on a Buckyclutcher column suggest that there are some metallofullerene isomers of AcC82. The identical HPLC retention time of the major AcC82 peak with that of La@C82 indicates that the structure of one of the AcC82 isomers is the same as La@C82.