Comparison between the effect of Beta and Gamma irradiation on the optical constants of PMMA films

• Autores: Bushra A. Hasan, Muna A. Saeed, Ahmad Abbas
• Localización: Atti della Fondazione Giorgio Ronchi, ISSN 0391-2051, Anno 66, Nº. 4, 2011, págs. 505-517
• Idioma: inglés
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• Resumen

  • 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.