Radiolysis and Annealing of Damage Entities in γ-Irradiated Pure and Doped NaBrO₃

Abstract

Radiolysis of pure as well as doped (Ba 2+ ) sodium bromate has been carried out at different irradiation doses. Annealing of damage BrO", BrOj and non-Br-Ox between 393.0-433.0 Κ is enhanced with increasing temperature, irradiation dose as well as by cation doping. Analysing the data in the light of theories of diffusion controlled mechanisms, it is indicated that for each fragment recovery is a combination of one first order and one second order process. The Ζ vs. φ plots are linear in the initial period of recombination suggesting the validity of Smoluchowski boundary condition (SBC) theory.

Effect of Doping and Irradiation on the Decomposition of NaBrO3: A Kinetic Study

“…Earlier data [41] indicate that at an irradiation dose of 1.5 MGy, about 0.4% of bromate decomposes to bromide before thermal decomposition began. These decomposition products probably shatter [42] the crystals on heating and the resulting crystallites have many more point defects and other irregularities.…”

“…Incorporation of a divalent ion, Ba 2+ into the crystal lattice of the sodium bromate generates cation vacancy resulting free space [37,41] and local strain. The strain distorts the structure of the crystal and alters the frequency of phonon vibration in the lattice [43,44], There is also change in lattice structure surrounding the defect and a decrease in the symmetry of the bromate ion occurs.…”