Variation of Track length along paryicle trajectory through CR-39 stack sheets

An alpha- track was selected through a number of successive CR-39 sheets in a high energy nuclear reaction experiment. The experiment was aiming to identify particles emitted at an angle of 25 degree to the beam direction in bombarding a copper disk with relativistic fluorine ions. Most of these particles were identified as protons and alpha particles. The experiment showed that the inlet energy of an alpha particle to be detectable in CR-39 plastic is 53.4 MeV/n. The CR-39 range of such particles is about 2 cm long. The corresponding range for a proton is about 1 mm long. The track diameter at positions on the track length can display the damage as a function of the depth in the CR-39 material. Also the track length is measured along the particle trajectories in CR-39 sheets for a single track as a function of residual range in the CR-39 material. The REL for alpha tracks in CR-39 is calculated using Henke-Benton computer program. Comparison between REL and the damage was available along this track especially with the ability of CR-39 to prevail etched tracks