We present new calibration results of the CR39 nuclear track detector
made in collaboration with the Intercast Europe Co. of Panna, Italy. U
pper limit on the production of nuclei with fractional charge has also
been established. Results are also presented on the determination of
the total and partial charge changing fragmentation cross sections of
Si-28(14+) ions of 14.5 GeV/nucleon and of S-32(16+) ions of 200 GeV/n
ucleon in Copper targets.