Track-diameter kinetics in dielectric track detectors

Abstract The minor and major axes of track-pits of nuclear particles registered in dielectric solids are gradually varying in the course of the etching process. A general theoretical description of this variation (track-diameter kinetics) is given here for particles entering solids at arbitrary angles. The model has been extended to detectors with both isotropic and anisotropic etching properties. The determination of the formulas describing the variation of etch-pit axes during the etching process are separately discussed for constant and varying track etch rates. The characteristics of the model are illustrated for some particular cases. On the basis of the geometrical model of etch-pit evolution, new methods for the experimental determination of track parameters (track etch rate, entrance angle, range) are proposed. These methods applying to etch-pits of spontaneous fission tracks registered in glass detectors may help, among others, in the search for super-heavy transuranic elements.

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