APPLICABILITY OF THE GEMINATE MECHANISM TO THE DESCRIPTION OF RADIATION-INDUCED CONDUCTIVITY OF POLYMERS

Numerical calculations on the transient process of radiation-induced c onductivity upon homogeneous and continuous generation of isolated ion pairs for a model dielectric that imitates low-density polyethylene ( LDPE) or polytetrafluoroethylene (PTFE) in the absence of pair overlap ping (a low radiation dose) were carried out. The results obtained wer e compared with the available experimental data. For the experimental results to be consistent with the theory of geminate conductivity in p olymers of the LDPE, PTFE, or polypropylene type, it necessary to empl oy an additional factor that accounts for the kinetic hampering of the geminate recombination processes and the subsequent perturbation of t he Langevin mechanism of the bulk recombination of charge carriers.