New code for digital imaging system for track measurements

A code for the numerical analysis of images from a CCD camera, including co rrection of acquisition system defects, has been written and applied to the visualization of alpha-particle tracks in the solid state nuclear track de tectors CR39 and LR 115. A standard mask having different diameter holes pe rmitted the calibration of the imaging system. Comparison of manual scannin g results with those given by the automatic system are presented for detect ors exposed to alpha-particles of Am-241 source. As application, the system was used to measure specific activities of U-238 in the Moroccan phosphate s and their phosphogypsums samples by contact autoradiography. (C) 2000 Els evier Science B.V. All rights reserved.