Effects of Ultrasound in Etching and Detecting Parameters of CR-39 Detector

Effect of 40 khz ultrasound (us) in chemical etching of alpha-particle tracks in cr-39 solid state nuclear track detector were investigated. alpha-particle irradiations (using 1 μci ^241am source) were made with different energies under normal incidence. all track etch rates vd, vb, vt and v increased, but the critical angle of the detector θc decreased. the maximum increase in the bulk etch rate vb, the track's diameter growing rate vd, the etch rate ratio v, the etching efficiency η and sensitivity s were about 12% , 20%, 25%, 12.5% and 27.2%, respectively, while the decrease in the critical angle was about 15.2%. these results were in agreement with those found by [1, 2]. a minimum detection threshold energy of alphaparticle ~0.2 mev was recorded.