The experiment was done at 60℃ with KOH as etching solution. The results showed that the lower the alpha particle’s energy
the earlier the developing time of track. When the energy of particle was less than 70keV
the track could not be developed. The track size increased with increasing etching time. It changed rapidly with energy in the range from 1 to 4 MeV. As for energies was higher than 4MeV
the change decreased gradually. If the incident angle of alpha particle was greater than 40?
the actual incident angle would coincide the calculated value. But there was a great difference in the two angle values for the incident angle less than 40°.