Non-steady-state radiation-induced conductivity of poly(methyl methacrylate
) was studied at room and elevated temperatures. It was shown that the cond
uctivity is due to electric polarization of geminate pairs. The evolution o
f geminate pairs was rationalized in terms of the Rose-Fowler-Weisberg gene
ralized model. The conclusions by the model were compared with the results
of previous studies on the kinetics of formation and decay of geminate pair
s upon pulse radiolysis or flash photolysis of doped poly(methyl methacryla
te).