Ultraviolet Spectral Analysis of Polyvinyl (Butyral) Film Incorporating 10,12-Pentacosadiynoic Acid Monomer for Application in Radiation-Processing Dosimetry

A detailed study was performed to investigate the dosimetric characteristics of polyvinyl butyral containing 10,12-pentacosadiynoic acid (PCDA) monomer. PCDA monomer undergoes polymerization upon γ-ray exposure, inducing change in the absorption spectra in the UV region of the spectrum. The unirradiated film has four absorption peaks at 216, 227, 241, and 256 nm. Upon irradiation, two new peaks at 271 and 286 nm are developed and their amplitudes with the original peaks increase with increasing absorbed dose. The useful dose range is 3-100 kGy depending on PCDA monomer concentration. The expanded uncertainties (2σ) associated with dose measurement were estimated.