In order to investigate the effect of gamma irradiation on the conduct
ivity of polypyrrole, dc and ac conductivity measurements were carried
out by four-probe technique as a function of temperature and by using
Hall system at room temperature, respectively. Both ac and de conduct
ivities were found to exihibit a maximum at 1.80 kGy dose value. The d
e conductivity of irradiated polypyrrole films was found to vary expon
entially with (T)(-1) at high temperature, while (T)(-1/4) dependence
was observed at low temperature range.