Institution: | a Dipartimento di Fisica, Universita’ di Bologna e Sezione INFN di Bologna, Viale C. Berti Pichat 6/2, I-40127 Bologna, Italy b CNR, Istituto TESRE, Via P. Gobetti 101, I-40129 Bologna, Italy |
Abstract: | We present new calibrations of different production batches (from 1989 to 1999) of the INTERCAST CR-39, using the BNL-AGS 1 A GeV iron beam. The comparison with previous results, obtained with the 158 A GeV lead beam from the CERN-SPS shows that, while each production batch has a different calibration curve (mainly due to minor differences in the production conditions), the aging effect is negligible. We also tested the dependence of the CR-39 response from the time elapsed between exposure and analysis (fading effect). The fading effect, if present, is less then 10%. It may be compatible with the experimental uncertainties on the bulk etching rate vB. |