The publication demonstrates chelation studies of ferric ion with 1,2 bis (beta-aminoethoxy)ethane N, N, N,, N, sodium sulfonate triacetic acid (ASTA). The results showed the effectiveness of ASTA as a chelating agent by molar ratio, continuous variation and slope ratio methods. Stable complex 1:1 was formed at pH form 3.5 to 7. Solution of Fe (ASTA) chelate of different mole ratios at pH 3.5 and 7.5 were irradiated by gamma radiation for different doses. The results showed that a linear decrease of absorbance with dose was obtained which can be utilized as a dosimeter for weak dose rate in the studied range. A proposed radiolytic mechanism is discussed. The degradation of ligand was due to OH radical.