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The paper reports an investigation into the effect of track registration temperature on the track etching characteristics of CR-39 polymeric detectors exposed to a particles and fission fragments from a thin 252Cf source. The plastic detector was maintained at temperatures ranging from 77 K to 373 K during irradiation. It was observed that the overall track etching rate VT for a particles in CR-39 is influenced by registration temperature in a complex way. The value of the bulk etch rate VB, as measured from fission-fragment diameters, however, remained constant over the entire irradiation temperature range.

Thermoluminescence (TL) properties of sphene and epidote are of interest in studies related to their radiation damage. Natural and artifically induced TL of these minerals has, therefore, been investigated. Both minerals exhibit complex glow curves with several overlapping peaks. The Tm-TSTOP thermal cleaning procedure has revealed three peaks in the ? ray induced glow curve of each mineral. That these peaks obey second order kinetics was indicated by the continuously slanting structure of the Tm-TSTOP curve. The TL parameters E and s have been calculated using (i) the initial rise method, and (ii) the glow-peak shape method. In general, the values of E calculated by the first method are found to be higher than those from the second. The TL curve-fitting method is also applied in order to calculate these parameters and to serve as a cross-check on the results.

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