Direct and Indirect Radiolytic Effects in Highly Concentrated Aqueous Solutions of Bromide
- 1 April 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry A
- Vol. 115 (17), 4326-4333
- https://doi.org/10.1021/jp2012528
Abstract
Highly concentrated aqueous solutions of bromide were used to examine the total radical yield in the direct decomposition of water by γ-rays. Bromide concentrations were varied up to 6 M at which almost all OH• radicals, H• atoms, and hydrated electrons produced in the picosecond range oxidize bromide to ultimately form Br3−, a stable species that can easily be measured with a spectrometer. Considering only the decomposition of water in the presence of air and in acidic conditions, the apparent yield of oxidizing species is found to be around (10 ± 0.05) × 10−7 mol J−1. The absorption of irradiation dose by the solute at high concentration is discussed and quantitatively evaluated. At 6 M Br− solutions, 38% of the dose is absorbed by solutes and Br− is directly ionized. The optimal value for the initial yield of the radicals produced by direct radiolytic Br− ionization is found to be (9.6 ± 0.5) × 10−7 mol J−1.Keywords
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