Abstract
The present work has been carried out to study the potential of congo red dye as secondary dosimetry. Congo red dye solution is found to be sensitive towards gamma radiations. The molar extinction coefficient of the dye solution was found to be 2.70 × 10 5 l mol - 1 cm - 1 at λ max 499.0 nm. Aqueous congo red dye solution of 0.02 mM concentration was irradiated for varying γ doses (0.05–0.15 kGy). The G -values were calculated by estimating the amount of dye consumed due to radiolytic decomposition. The average G -value was found to be 63.30 mol 100 eV at the above concentration. The estimation was done spectrophotometrically using ELICO SL-150/ Shimadzu UV 240 spectrophotometer. The dose determined using congo red dye solution was found to be in agreement with that of Fricke dosimetry.
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