01-20U

Available experimental data for the frequency dependences of dielectric permittivity of LFCM are compared with the corresponding dependences of silica glasses. We analyse possible mechanisms of dielectric response of LFCM. We conclude that an essential increase in real and imaginary parts of dielectric permittivity in LFCM in comparison with non-irradiated silica glasses can be attributed to increase in dipoloe relaxation losses and thermal dipole polarization due to widening of the activation energy spectrum. A quantitative agreement with experimental data is obtained.