Abstract
The track registration properties of different types of CR-39 solid state nuclear track detectors (MA-ND, Pershore, Tastrak) were studied in vacuum for alpha particles with different energies. The alpha particle response is characterized by the etch induction time and the etch rate ratio. It is found that the etch induction time increases and the etch rate ratio decreases in vacuum and different types of CR-39 show different behavior. The role of the pre outgassing time and post storage time in vacuum in the latent track formation is discussed. The effect of storage time in normal air at different temperatures was also studied in a three year period. A slow but definite decrease of sensitivity was observed, which was negligible at lower temperature.
Published Version
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