Abstract
Fe-ion tracks (590 MeV/nuc.) were studied in Daicel cellulose nitrate plastic detectors. A delay between the onset of the track etching and the immersion of the plastic sheet in the NaOH etching solution was found. From this etch induction time we postulate a 1–2 μm thick surface crust in which no track etching occurs. After this crust is etched away the track etching rate is uniform all over the volume of the detector sheet. The removal of the crust may be done either during regular etching at high temperatures (40°C) or in a pre-etch soaking procedure in cold NaOH at 2.5°C.
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