Abstract
Bulk samples and thin sections of polyethylene terephthalate (PET) and polyimide (PI) were irradiated with Se and Pb ions of 11.4 MeV per nucleon. The creation of latent tracks and structural changes were studied by means of transmission electron microscopy (TEM). In order to improve the radiation resistivity of the polymer under the electron beam and to enhance the contrast of the tracks, the samples were chemically stained with OsO 4 or RuO 4 before and/or after the ion irradiation. Depending on the preparation technique, the cross-sections of the tracks appear as circular objects of reduced or increased contrast. The diameter of the tracks depends on the ion species and on the sample preparation and varies between 9 and 17 nm.
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