Systematic evaluation of the influence of simultaneous - and -radiation from radium isotope on the electrical and photoluminescent response of hybrid nanocomposites obtained by adding porous silicon nanoparticles into poly(3,4-ethylenedioxythiophene) doped by poly(styrenesulfonate) host matrix is presented. It was found the decrease in the photoluminescence intensity and increasing the electrical conductivity of hybrid film because of radiation exposure. Radiation-induced changes occur in the polymer as well as in PS nanoparticles contributing simultaneously to the total electrical response. The obtained results expand the perspective of nanocomposite applications for radiation sensing.