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The effect of store for along time away from the optimum store condition for solid state nuclear track detector CR-39 was studied in this work, after irradiated by αparticles emitted from 241 Am(1µCi) source with 3.5 MeV energy for 3min. The detector pieces were etched in 4N-6.25N aqueous solution of NaOH maintained at temperature 70 C o for various times from 0.75 hr -6 hr. The results showed that the optimum condition was 5 N for aqueous solution and 3 hr for etching time at temperature 70 Cdoi:10.33899/edusj.2012.58992 fatcat:jzcfmrlgtja2dlyfor77btjgyy