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Dye wastewater containing an azo dye, direct red 28 was prepared in triple distilled water and was irradiated by gamma radiation. The decoloration of dye wastewater was determined spectrophotometrically. It was found out that the wastewater containing the dye could efficiently be decolorized and degraded using the gamma radiation and in presence of different additives. Starting with the concentration of 30?mg/L, almost 100% decoloration of this dye wastewater can be achieved using the radiation dose of only 2.2?kGy. [ABSTRACT FROM PUBLISHER]