FTIR spectroscopy has been in use broadly to study microscopic areas in polymers for the last years. The FTIR transmission spectra of coumarin laser dye, polystyrene and coumarin doped polystyrene films with different doping ratio of coumarin solution have been studied. These spectra measured and explained for all films before and after Alpha irradiation with different irradiation times. All samples prepared by casting method. FTIR corroborate chemical bonds of coumarin dye molecules and polystyrene films by producing an IR absorption spectrum when increasing doping ratio of coumarin solution and when irradiation by Alpha source. There are some bonds disappeared after irradiation.

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Rhodamine 6G- polyvinylalcohol (Rh6G/PVA) films were prepared via casting route at room temperature with different volume of Rh6G dye solution (5, 10, 15, 20, 25 and 30 ml). The optical properties of as-prepared films were characterized using UV–Vis spectrophotometer at a wavelength range of 200-800 nm. The absorption peak of the pure PVA film does not affect by adding the Rh6G dye solution while exhibited increase in intensity of the absorption spectrum. Furthermore, the absorption peak of Rhodamine 6G demonstrated red-shift about 10 nm. Energy band gap slightly affected by adding Rh6G dye solution. The amazing influence of heat treatment on the physical properties of Rh6G/PVA films appeared due to red-shift and decrease the energy band gap. The results exposed that the best sensitivity calculated at temperature 40 °C for as-grown Rh6G (15 ml)/PVA film around 35.74%.

Gamma ray effect has been worked out on PMMA/PS blends at different concentrations. The optical constants such as the absorption coefficient, refractive index are calculated, and optical energy gap (direct/indirect) has been studied before and after irradiation. Transmittance, absorbance, and reflectance spectra of pure and blends polymers are investigated.

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