Resumen de Comparison between the effect of Beta and Gamma irradiation on the optical constants of PMMA films
Bushra A. Hasan, Muna A. Saeed, Ahmad Abbas
Films of different thiekness (t) of PMMA have been made using casting method. The optical constants (refractive index n, extinction coefficient k, real and imaginary parts of dielectric constant ε[subíndice 1] and ε[subíndice 2] and the optical energy gap E[subíndice g] in the wavelength range 200-900 nm were determined using the absorbance and reflectance spectrum and then irradiated with Gamma and Beta rays. In the absence of radiation the data reveal that the increase of t increases n but decreases k. The exposition to beta and gamma rays increases n and k values indicating cross-linking domination of polymer chain. The optical energy gap behaves in the same manner ask with thickness variation and with exposure to radiation.
