The nuclear track detector CR39: results from different experiments

The nuclear track detector CR39 was calibrated with different ions of different energies. Due to the low detection threshold (Z/β∼6e) and the good charge resolution (σZ∼0.2 for 6e⩽Z/β⩽83e with 2 measurements), the detector was used for different purposes: (i) fragmentation of high and medium energy ions; (ii) search for magnetic monopoles, nuclearites, strangelets and Q-balls in the cosmic radiation.