研究了以KOH作蚀刻液、恒温60℃蚀刻时CR-39探测器的α粒子径迹情况。实验表明,α能量越低则径迹显现时间越短;能量低至70keV时,CR-39就不能显出径迹。径迹直径随蚀刻时间延长而增大。能量1—4MeV时径迹随能量变化较快;超过4MeV时,这一变化逐渐减小。当α粒子的入射角大于40°时,实际角度和根据径迹参数而求得的角度非常一致;而小于此角时,两者相差较大。 The particle trajectory of CR-39 detector with KOH as etching solution and constant temperature of 60 ℃ was investigated. Experiments show that the lower the alpha energy is, the shorter the track appears. The energy CR-39 can not show the track when the energy is as low as 70 keV. Track diameter increases with etching time. The energetic changes of the track with energies from 1 to 4 MeV are faster; when 4 MeV, the change decreases gradually. When the incident angle of α particle is greater than 40 °, the actual angle and the angle obtained from the track parameters are very consistent. When the angle is smaller than the angle, the difference between them is large.