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Comparative study of two azo dyes using Triphenyl-Tetrazolium Chloride (TTC) on gamma irradiation induced film dosimeter

2020; Elsevier BV; Volume: 466; Linguagem: Inglês

10.1016/j.nimb.2020.01.019

1872-9584

Priyanka R. Oberoi, Chandan Ashokrao Fuke, Chandra B. Maurya, Prakash A. Mahanwar,

Photochromic and Fluorescence Chemistry

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.