Positron Annihilation Lifetime Spectroscopy in Neutrons Irradiated CR39 Polymer
Positron Annihilation Spectroscopy (PAS) is considered as one of the powerful nuclear probe techniques where the angstrom size could be tracked 1. The availability of PAS proved in the characterization of metals 2, semiconductors and polymers3. It is well demonstrated the success of using PAS to determine the free volumes (0.1-1 nm), voids (>1nm) and layer properties in polymeric system. Positron Annihilation Lifetime Spectroscopy (PALS) based on the measure of positron life time spanned inside matter. CR39 is an amorphous polymer, sensitive to charged particles, gamma rays and neutrons. One of the known uses, is being as solid state nuclear track detector (SSNTD4. Actually, we can characterize the CR39 as an amorphous polymer using the free volume key (kind of defects existed in polymers) which has an important correlation with the macroscopic properties.
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