Abstract
The change in optical properties on exposure to radiation has been studied for polyvinyl alcohol, 2, 3, 5-triphenyl tetrazolium chloride salt dyed films. The comparative results between the two different dyes namely methyl orange and di-methyl yellow have been studied for the change in color for the application of dosimeter. The film samples exposed at different doses from 0 to 30 kGy by exposing gamma rays using 60Cobalt gamma source at 0.95 kGy/hour. The visual color change from yellow to red for films containing methyl orange dye whereas change in color from greenish-yellow to red for films containing di-methyl yellow dye have been observed after gamma irradiation and confirmed using various characterization techniques. Colorimetric analysis shows differentiation between the visual color change by comparing colorimetric coordinates like L* a* and b* to each other. Whereas the change in absorption band by UV–Visible spectrophotometer shows an increase in the absorption with an increase in the doses. The FT-IR analysis reveals the change in structural groups. The reproducibility and post-stability studies established and further considered to be used as a routine dosimeter.
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