Effect of gamma irradiation dose on phthalate free PVC dyed thin film dosimeter

The effect of irradiation on optical properties of the film dosimeter made up of polyvinyl chloride based dimethyl yellow using a phthalate free plasticizer. The comparative results at different dye concentration have been studied. The film samples subjected to gamma irradiation at various doses (1-5, 10, 15, 20, 25 and 30 kGy) in a controlled manner using 60 Cobalt gamma source at 12.5 kGy/hour. The color change from yellow to red has been observed after gamma irradiation which have been differentiated by color spectroscopy and measuring the absorbance. UV-Vis spectrophotometer shows an increase in absorbance with the increase in absorbed dose. The radiation chemical yield shows the g-values for dye concentrations of 0.2, 0.4 and 0.6 phr. The FT-IR analysis reveals the change in structural groups. The use of phthalate free plasticizer shows the stability of the films analyzed for 180 days.