DETERMINATION OF THRESHOLD RADIATION DOSE IN THE DEGRADATION PROCESS OF INDIGO DYE BY GAMMA IRRADIATION TECHNIQUE

T. S. Bich1, S.P. Mallam2, D.G. Diso1 and M.A.Y. Hotoro1
1Department of Physics, Kano University of Science and Technology, Wudil, Kano, Nigeria
2Nigeria Atomic Energy Commission, Abuja, Nigeria
Email: tsbichiosh@yahoo.com
ABSTRACT
Irradiation of indigo dye samples with gamma radiation at different radiation doses reveal that as radiation dose is increased the absorbance of the dye decreases. At the radiation dose of 0.6 kGy the spectral peak of the dye samples completely disappears indicating complete degradation of the dye. It is further observed that the behavior/decrease in absorbance of the dye samples has a peculiarity at the radiation dose of 0.3 kGy. Such peculiarity is also clearly observed in the curves for absorbance versus radiation dose, Full Width at Half Maximum (FWHM) versus radiation dose, peak height versus radiation dose and change in base points versus radiation dose. The possible implication of these observations is discussed.