Elemental concentrations were determined by PIXE analysis performed with a proton beam of 6 mm diameter and 2.0 MeV energy from a tandem accelerator of the Department of Nuclear Engineering, Kyoto University. Beam intensities from 10 to 60 nA were employed and the total doses were about 20 lC. X-rays with 1.4–14.8 keV energy emitted from the target were detected by a Si(Li) detector,whi ch had a resolution of 152 eV at 5.9 keV. The target and detector were set at 90 and 135 with respect to the direction of the ion beam,respect ively. A 39.3 lm thick Mylar absorber was set between the target and detector.