The influence of gamma-irradiation on the dielectric properties of the
relaxors of PLZT system (in the range low (LF) - and infralow frequen
cy (ILF)) were investigated. The phenomenon discovered in this work ar
e confirming the point of view which had been early that the different
of the phase state of these materials at the process of irradiation i
s principal cause of the different of the dielectric response of the i
rradiated PLZT system with the large concentrations of La and the syst
em with the average concentrations of La.