Radiation Effects on the Property of ²³⁸U (VI) or ²³⁹Pu (IV) Doped Polyvinyl Alcohol Films Investigated by EPR and PAS

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Electron paramagnetic resonance (EPR) and photoacoustic spectral (PAS) studies were conducted on pure polyvinyl alcohol (PVA) film, ²³⁸U (VI) doped PVA film after gamma irradiation and ²³⁹Pu (IV) doped PVA film after in-situ alpha irradiation. Studies on gamma irradiated U (VI) doped PVA film revealed the formation of U (V) complex and free radical -CH₂-C (OH) CH₂-. The later was also formed in pure PVA film. The in-situ alpha-irradiation resulted in a broad line at g =1.998 ± 0.001 in addition to weak lines due to -C (O) =CH₂- and -CH₂-C (OH) CH₂-. The broad line appears to be due to high local concentration of these radicals which increased with longer in-situ irradiation. With long storage, a doublet, presumably due to interaction of -C (O) =CH₂- with I = 1/2 of ²³⁹Pu got evolved.