Abstract
Development of radiochromic dosimetry systems for industrial and food irradiation programme is of paramount importance. Reliable dose measurements can only be achieved by understanding the radiation response and subsequent optimization of dosimeter recipe. In view of this, radiolysis of acetonitrile solutions of crystal violet and leuco crystal violet containing 2,2,2-trichloroethanol as sensitizer was studied under aerated conditions to determine role of each ingredient. In crystal violet based system, decrease in absorbance on exposure to gamma rays was linear in the dose range of 50–600 Gy. The radiochemical yield was observed to increase non-linearly with dye concentration, reaching a constant value for crystal violet concentrations greater than 50 μM. For leuco crystal violet based system, formation of coloured crystal violet cation exhibited a sigmoidal increase with dose for exposures in the range from 100 to 500 Gy. The radiochemical yields evaluated were in range of 0.0141–0.0395 μmol/J depending on the concentrations of the leuco dye and sensitizer. The observed radio-chemical behaviours of all the constituents provided interesting leads to design potential dosimetry systems.
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