Experiments of using home made CR-39 films to register alpha-particles were carried out. After exposing the CR-39 film to an alpha source

distinct tree-like tracks on the foil had been found by using reasonable chemical and electrochemical etching treatment. Under the identical exposure condition

there was a linear relationship between alpha-particle fluence and track density. The relative register efficiency was 20% and average back-ground tracks 0.2/mm

2

.