Nuclear Instruments and Methods in Physics Research. Section B, Beam interactions with materials and atoms vol:129 issue:1 pages:65-72
Electrochemically etched polycarbonate nuclear track detectors have been used to detect the beta-delayed alpha-decay of the Na-20 nuclei that were produced in the study of the astrophysically important Ne-19(p,gamma)Na-20 reaction. The application required preceding investigations and developments. The insensitivity to beta-radiation has been confirmed in off-line irradiations with beta-sources up to doses of 20000 Gy. The density of intrinsic background tracks has been reduced to a mean value of 1.3 +/- 0.1 cm(-2). The response function for alpha-detection as a function of energy and angle of incidence has been determined using Rutherford backscattered alpha-particles. A model for electrochemical etching that is generally valid for all ions and plastic detectors has been developed. It successfully reproduced the measured response function and track diameters.