Abstract
The present study deals with the effect of gamma-irradiation doses in the range of (100-500 kGy) on the optical properties of quaternary (SaTe.)5(GeSe2)(95) film. The complex index of refraction (real (n) and real (k)) and the film thickness for the as-prepared and exposed films were determined precisely based only the measured transmittance spectra. A clear red shift of the absorption edge was noted by increasing gamma-irradiating doses. Such a shift leading to the observed decrease in the optical gap E-og. Such a behavior of E-og can be due to the induced defects in the films due to beta-irradiation. The index of refection (n) has been discussed in terms of the dispersion model. The dispersion parameters were determined and well discussed in detail. The observed results show that, the (SaTe(2))(5)(GeSe4)(95) thin films can be employed as radiation dosimeter for radiation measurements.