Physicochemical Study of Gamma-irradiated Mono Azo Dye in Aqueous Solutions as Liquid Dosimeter

Aqueous solutions of pH indicator (mono azo dye) Amacid Yellow M (AYM) dye were titrated by different concentrations of (H⁺ ) resulting from irradiation decomposition of trichloroethylene (ClHC=CCl₂ ) (TCE) solution for possible use as an monitoring device (label) for gamma radiation. The titrated solutions were readout spectrophotometrically. These solutions can be used qualitatively as routine indicators in the 0.5–5 kGy range because they have stable change in color for (AYM) from yellow to red at 540 nm depending on irradiated trichloroethylene [H⁺ ]. The effective dose range exceeds in this technique due to avoiding direct exposure of dye to gamma radiation, utilizing back titration technique followed by color measurements using spectrophotometer. Moreover, the useful measuring range was found to be 5kGy.The solutions can be used qualitatively as routine indicators in the range of 0.5 to 2kGy. Further calculations such as rate of reaction (r) and kinetic constant (k) have been assigned.